CA2102296C - Protective respirator's air guidance system and protective respirator - Google Patents
Protective respirator's air guidance system and protective respirator Download PDFInfo
- Publication number
- CA2102296C CA2102296C CA002102296A CA2102296A CA2102296C CA 2102296 C CA2102296 C CA 2102296C CA 002102296 A CA002102296 A CA 002102296A CA 2102296 A CA2102296 A CA 2102296A CA 2102296 C CA2102296 C CA 2102296C
- Authority
- CA
- Canada
- Prior art keywords
- respirator
- air
- section
- heat exchange
- frame section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B9/00—Component parts for respiratory or breathing apparatus
- A62B9/003—Means for influencing the temperature or humidity of the breathing gas
-
- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
- A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
- A41D13/11—Protective face masks, e.g. for surgical use, or for use in foul atmospheres
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B18/00—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
- A62B18/02—Masks
- A62B18/025—Halfmasks
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- Health & Medical Sciences (AREA)
- Pulmonology (AREA)
- General Health & Medical Sciences (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physical Education & Sports Medicine (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Zoology (AREA)
- Respiratory Apparatuses And Protective Means (AREA)
- Manufacture Of Tobacco Products (AREA)
- Confectionery (AREA)
- Ventilation (AREA)
- Outer Garments And Coats (AREA)
Abstract
The object of this invention is a valve arrangement of a protective respirator intended for protecting the weaker against dust or gases. The invention sets out how the exhalation air is guided as soon as possible out of the face section (7) and further how to air can be caused to pass through an air enclosure (11) in between the face section (7) and the frame section (3).
Description
W~ 92/19322 ~ ~ ~ ~ ~ ~ ~j PCT/F192/00137 PROTECTIVE RESPIRATOR'S AIR GUIDANCE SYSTEM AND PROTECTIVE
RESPIRATOR
This invention concerns an air guidance system for a protec-tive respirator and a protective respirator.
Protective respirators have conventionally been used mainly in industrial work and agricultural work in order to protect the user against harmful dust and gases. Protective respira-tors are being used increasingly in the home as well; e.g. in order to avoid pollen allergy. The following is a description of some alternative solutions concerning the valve arrange-ment of protective respirators.
In accordance with FI patent application 833006, the exhala-tion valve of a filter bridge type of a half mask is located at an angle in the upper part of the mask's visor to enable the exhaled air to exit. In accordance with EP patent appli-cation 258508, the exhalation valve and the inhalation valve have been located concentrically in the face section of the respirator's fore part. The exhalation air is conveyed di-rectly into the surrounding air from the face section.
One of the major problems with protective respirators is the formation of condensated water on the sealing surface of the face section. The excess moisture causes powerful bacterial growth on the surfaces in contact with the skin and thus leads to skin infections and hypersensitiveness. Further, the mask is extremely unhygienic should more than one person take turns in wearing it. The formation of condensated water is caused by the air temperature outside the face section of the device being lower than inside the face section. The warm and moist exhalation air condensates on the surfaces of the face section when the temperature of these surfaces falls below what is referred to as the dewpoint temperature.
Another significant problem is encountered when breathing in ,,,, , cold inhalation air in sub-zero temperatures. Since breathing through the. protective respirator always causes some degree of breathing resistance, the person using the respirator is generally forced to breath in the air using such a breathing technique as will cause the cold air to pass (especially when working reasonably hard) directly into the person's respira-tory organs. Person's afflicted by asthma run a definite health risk in such a situation.
Often, sub-zero temperatures also lead to the formation of ice in the exhalation valve. When this happens, non-filtered air may leak via the exhalation valve in the wrong direction into the face section.
A common shortcoming in protective respirators is that the exhalation air leaves the respirator too close to the inhala-tion inlet. This leads to the risk that the carbon dioxide concentration of the air breathed in may rise to an excessive level. High carbon dioxide levels causes headache, fatigue, and even loss of consciousness in extreme cases. According to the authorities, a carbon dioxide concentration limit of ca.
1 % is still safe when breathing in.
A shortcoming in several currently available masks that redu-ces work safety and wearing comfort is that the user's spec-tacles and protective goggles tend to fog up because of the warm and moist exhalation air. This is generally due to the exhalation air having the possibility of being guided unobst-ructed from the exhalation valve directly onto the user's spectacles or goggles.
Since the exhalation valve on conventional protective respi-rators is on the outside of the mask in the immediate vi-cinity of the surrounding non-filtered air,.a leak in the exhalation valve may result in the unfiltered air outside the valve and in its immediate vicinity being admitted in small amounts along with the inhalation air because of the suction ...
RESPIRATOR
This invention concerns an air guidance system for a protec-tive respirator and a protective respirator.
Protective respirators have conventionally been used mainly in industrial work and agricultural work in order to protect the user against harmful dust and gases. Protective respira-tors are being used increasingly in the home as well; e.g. in order to avoid pollen allergy. The following is a description of some alternative solutions concerning the valve arrange-ment of protective respirators.
In accordance with FI patent application 833006, the exhala-tion valve of a filter bridge type of a half mask is located at an angle in the upper part of the mask's visor to enable the exhaled air to exit. In accordance with EP patent appli-cation 258508, the exhalation valve and the inhalation valve have been located concentrically in the face section of the respirator's fore part. The exhalation air is conveyed di-rectly into the surrounding air from the face section.
One of the major problems with protective respirators is the formation of condensated water on the sealing surface of the face section. The excess moisture causes powerful bacterial growth on the surfaces in contact with the skin and thus leads to skin infections and hypersensitiveness. Further, the mask is extremely unhygienic should more than one person take turns in wearing it. The formation of condensated water is caused by the air temperature outside the face section of the device being lower than inside the face section. The warm and moist exhalation air condensates on the surfaces of the face section when the temperature of these surfaces falls below what is referred to as the dewpoint temperature.
Another significant problem is encountered when breathing in ,,,, , cold inhalation air in sub-zero temperatures. Since breathing through the. protective respirator always causes some degree of breathing resistance, the person using the respirator is generally forced to breath in the air using such a breathing technique as will cause the cold air to pass (especially when working reasonably hard) directly into the person's respira-tory organs. Person's afflicted by asthma run a definite health risk in such a situation.
Often, sub-zero temperatures also lead to the formation of ice in the exhalation valve. When this happens, non-filtered air may leak via the exhalation valve in the wrong direction into the face section.
A common shortcoming in protective respirators is that the exhalation air leaves the respirator too close to the inhala-tion inlet. This leads to the risk that the carbon dioxide concentration of the air breathed in may rise to an excessive level. High carbon dioxide levels causes headache, fatigue, and even loss of consciousness in extreme cases. According to the authorities, a carbon dioxide concentration limit of ca.
1 % is still safe when breathing in.
A shortcoming in several currently available masks that redu-ces work safety and wearing comfort is that the user's spec-tacles and protective goggles tend to fog up because of the warm and moist exhalation air. This is generally due to the exhalation air having the possibility of being guided unobst-ructed from the exhalation valve directly onto the user's spectacles or goggles.
Since the exhalation valve on conventional protective respi-rators is on the outside of the mask in the immediate vi-cinity of the surrounding non-filtered air,.a leak in the exhalation valve may result in the unfiltered air outside the valve and in its immediate vicinity being admitted in small amounts along with the inhalation air because of the suction ...
produced during the inhalation stage.
The air guidance system of the respirator in accordance with the invention brings about a decisive improvement to the above shortcomings. In order to implement these improvements, the air guidance system of the respirator of the protective breathing apparatus type in accordance with the invention is characterised by an air guidance system for a respirator protecting the user against air impurities, the said respirator being formed of a face sealing section (7) made of a rubber type substance, of inhalation and exhalation valves (5, 6) connected onto a frame section (3) and a valve frame (4), of a filter (2), through which air is breathed into the face section (7), characterized in that the air that passes through the exhalation valve (6) is guided into an enclosure (11) between the frame and face sealing sections (3, 7). The respirator is characterised by a protective respirator for the purpose of protecting the wearer against air impurities, the said respirator being formed of a face sealing section (7) made of a rubber-like substance, of inhalation and exhalation valves (5, 6) connected onto a frame section (3) and a valve frame (4), of a filter (2), through which air is breathed into the face section (7), characterized in that the air that the outlet aperture of the exhalation valve (6) is between the frame and face sealing sections (3, 7) and the inlet aperture of the inhalation valve (5) is in the frame section (3) underneath the filter surface.
The foremost advantage of the invention may be seen in that the formation of condensated water on the sealing surfaces of the face section is markedly reduced. This is accompanied by the warming up of the inhalation air and the respirator is safe to use even in sub-zero temperatures. Further, the mixing up of exhalation air into the inhalation air is minimised.
21137538.1 In the arrangements in accordance with the invention, due to the location of the exhalation valve, the air leaked by the exhalation valve is noticeably cleaner than the air surroun-ding the respirator, because the unclean surrounding air is not in the immediate vicinity of the exhalation valve, the leaked air has, in the main, composed of air that has been filtered once and then exhaled. As an example, air containing particles as impurities is cleaner between the frame and face sealing section than on the outer surface of the mask, because the exhaled air stays around the exhalation valve in between the user's breaths and the pressure of the exhaled air forces unclean air away through the valve opening.
In the following, the invention is explained in detail with references being made to the appended drawings.
Figure 1 is an exploded presentation of the protective respirator.
21137538.1 Figure 2 shows the protective respirator from above and partially as a sectional presentation.
Figure 3 shows a side view of the protective respirator and partly as a sectional view along the line C-C in fig. 2.
Figures 4a and 4b show two different implementations of the heat exchange surfaces.
Figure 5 is an isometric assembly drawing of a respirator in accordance with the invention.
Fig. 1 is a schematic exploded presentation of a protective respirator in accordance-with the invention. The respirator is composed of a lattice section 1 protecting the filter, a filter 2, a frame section 3 made up of supporting ribbing with a hole for the inhalation air, a valve frame 4 onto which the inhalation and exhalation valves are mounted, and a face sealing section 7 that is connected to a valve frame 4 by means of the respirator's mounting straps, these straps not being shown in fig. 1. The top of the respirator's frame section 3 houses an air guidance plate 8.
Fig. 2 shows the protective respirator as seen from above and partially as a sectional view of it. The mounting straps 3 are indicated by dashed lines in the drawing.
Fig. 3 shows the assembled mask placed over the user's face:
The presentation is a side view partially as a sectional presentation along the line C-C shown in fig. 2. The drawing shows how the warm exhalation air is guided through the exha-lation valve 6 into the air enclosure 11 between the frame section 3 and the face sealing section 7. Due to convec-tional force, the warm exhalation air rises upward in the air enclosure 11 until it meets the air guidance plate 8. The air 21137538.1 guidance plate 8 guides most of the warm air to the rear and up toward the ears of the person wearing the protective 21137538.1 WO 92/19322 ~ ~ ~ ~ ~ ~ ~ PGT/F192/00137 respirator. This being the case, a flow of warm air is gene-rated in the air enclosure formed between the protective respirator's frame section and the face sealing section, the said flow of warm air keeping the temperature in the said air 5 enclosure essentially higher than that of the outside air.
The number 16 indicates a removable protective visor.
The warm exhalation air in the air enclosure maintains the temperature of the face sealing section's outside surface above the dewpoint temperature and thereby the formation of condensated water on the inner surfaces of the face sealing section is significantly reduced.
The warm exhalation air in the air enclosure also warms up the heat exchange surface 12 forming the rear surface of the frame section 3. Heat is transmitted by conduction from the heat exchange surface to the supporting ribbing 13. On being warmed up, the supporting ribbing releases heat into the filtered inhalation air flowing between the ribbing. Thus, the temperature of the inhalation air is not dangerously cold even for persons afflicted by asthma.
Since the exhalation air rich in carbon dioxide flows in its own air enclosure and exits essentially via the ends of the respirator, there is little chance of it finding its way back to be breathed in once again. This enhances the respirator's operational safety.
Due to the guiding plate 8 the warm air is prevented from causing fogging up of spectacles or goggles.
Figs. 4a and 4b shows another possible solution for the structure of the heat exchange surface 12. The ribbing 13 is thus formed that the frame section 3 is essentially of the same thickness at the points of the ribs as it is next to the transfer channels 10. The said construction facilitates a more efficient exchange of heat because of the greater surfa-?1~~~J~
s ce area and more even thickness of the frame section.
Fig. 5 shows a fastening stud 15 by means of which the latti-ce section 1 is fastened onto the frame section. The pressure equalising apertures 14 can be executed, for example, into the section of the lattice 1 curving underneath the respira-tor. When this is done, the said pressure equalising apertu-res converge with the apertures made into the corresponding parts of the frame section 3 when the respirator is assem-bled.
It should be noted that the respirator in accordance with the invention has been described with reference having been made to only one of its advantageous implementation examples. This is in no way intended to restrict the invention to only this one example. Instead, all modifications of the inventive idea within the scope defined in the patent claims are, naturally, possible.
The air guidance system of the respirator in accordance with the invention brings about a decisive improvement to the above shortcomings. In order to implement these improvements, the air guidance system of the respirator of the protective breathing apparatus type in accordance with the invention is characterised by an air guidance system for a respirator protecting the user against air impurities, the said respirator being formed of a face sealing section (7) made of a rubber type substance, of inhalation and exhalation valves (5, 6) connected onto a frame section (3) and a valve frame (4), of a filter (2), through which air is breathed into the face section (7), characterized in that the air that passes through the exhalation valve (6) is guided into an enclosure (11) between the frame and face sealing sections (3, 7). The respirator is characterised by a protective respirator for the purpose of protecting the wearer against air impurities, the said respirator being formed of a face sealing section (7) made of a rubber-like substance, of inhalation and exhalation valves (5, 6) connected onto a frame section (3) and a valve frame (4), of a filter (2), through which air is breathed into the face section (7), characterized in that the air that the outlet aperture of the exhalation valve (6) is between the frame and face sealing sections (3, 7) and the inlet aperture of the inhalation valve (5) is in the frame section (3) underneath the filter surface.
The foremost advantage of the invention may be seen in that the formation of condensated water on the sealing surfaces of the face section is markedly reduced. This is accompanied by the warming up of the inhalation air and the respirator is safe to use even in sub-zero temperatures. Further, the mixing up of exhalation air into the inhalation air is minimised.
21137538.1 In the arrangements in accordance with the invention, due to the location of the exhalation valve, the air leaked by the exhalation valve is noticeably cleaner than the air surroun-ding the respirator, because the unclean surrounding air is not in the immediate vicinity of the exhalation valve, the leaked air has, in the main, composed of air that has been filtered once and then exhaled. As an example, air containing particles as impurities is cleaner between the frame and face sealing section than on the outer surface of the mask, because the exhaled air stays around the exhalation valve in between the user's breaths and the pressure of the exhaled air forces unclean air away through the valve opening.
In the following, the invention is explained in detail with references being made to the appended drawings.
Figure 1 is an exploded presentation of the protective respirator.
21137538.1 Figure 2 shows the protective respirator from above and partially as a sectional presentation.
Figure 3 shows a side view of the protective respirator and partly as a sectional view along the line C-C in fig. 2.
Figures 4a and 4b show two different implementations of the heat exchange surfaces.
Figure 5 is an isometric assembly drawing of a respirator in accordance with the invention.
Fig. 1 is a schematic exploded presentation of a protective respirator in accordance-with the invention. The respirator is composed of a lattice section 1 protecting the filter, a filter 2, a frame section 3 made up of supporting ribbing with a hole for the inhalation air, a valve frame 4 onto which the inhalation and exhalation valves are mounted, and a face sealing section 7 that is connected to a valve frame 4 by means of the respirator's mounting straps, these straps not being shown in fig. 1. The top of the respirator's frame section 3 houses an air guidance plate 8.
Fig. 2 shows the protective respirator as seen from above and partially as a sectional view of it. The mounting straps 3 are indicated by dashed lines in the drawing.
Fig. 3 shows the assembled mask placed over the user's face:
The presentation is a side view partially as a sectional presentation along the line C-C shown in fig. 2. The drawing shows how the warm exhalation air is guided through the exha-lation valve 6 into the air enclosure 11 between the frame section 3 and the face sealing section 7. Due to convec-tional force, the warm exhalation air rises upward in the air enclosure 11 until it meets the air guidance plate 8. The air 21137538.1 guidance plate 8 guides most of the warm air to the rear and up toward the ears of the person wearing the protective 21137538.1 WO 92/19322 ~ ~ ~ ~ ~ ~ ~ PGT/F192/00137 respirator. This being the case, a flow of warm air is gene-rated in the air enclosure formed between the protective respirator's frame section and the face sealing section, the said flow of warm air keeping the temperature in the said air 5 enclosure essentially higher than that of the outside air.
The number 16 indicates a removable protective visor.
The warm exhalation air in the air enclosure maintains the temperature of the face sealing section's outside surface above the dewpoint temperature and thereby the formation of condensated water on the inner surfaces of the face sealing section is significantly reduced.
The warm exhalation air in the air enclosure also warms up the heat exchange surface 12 forming the rear surface of the frame section 3. Heat is transmitted by conduction from the heat exchange surface to the supporting ribbing 13. On being warmed up, the supporting ribbing releases heat into the filtered inhalation air flowing between the ribbing. Thus, the temperature of the inhalation air is not dangerously cold even for persons afflicted by asthma.
Since the exhalation air rich in carbon dioxide flows in its own air enclosure and exits essentially via the ends of the respirator, there is little chance of it finding its way back to be breathed in once again. This enhances the respirator's operational safety.
Due to the guiding plate 8 the warm air is prevented from causing fogging up of spectacles or goggles.
Figs. 4a and 4b shows another possible solution for the structure of the heat exchange surface 12. The ribbing 13 is thus formed that the frame section 3 is essentially of the same thickness at the points of the ribs as it is next to the transfer channels 10. The said construction facilitates a more efficient exchange of heat because of the greater surfa-?1~~~J~
s ce area and more even thickness of the frame section.
Fig. 5 shows a fastening stud 15 by means of which the latti-ce section 1 is fastened onto the frame section. The pressure equalising apertures 14 can be executed, for example, into the section of the lattice 1 curving underneath the respira-tor. When this is done, the said pressure equalising apertu-res converge with the apertures made into the corresponding parts of the frame section 3 when the respirator is assem-bled.
It should be noted that the respirator in accordance with the invention has been described with reference having been made to only one of its advantageous implementation examples. This is in no way intended to restrict the invention to only this one example. Instead, all modifications of the inventive idea within the scope defined in the patent claims are, naturally, possible.
Claims (9)
1. A protective respirator with air guidance means, the respirator comprising a face sealing section made of a rubber type substance;
a frame section located outside of the face sealing section, defining an enclosure between the face sealing section and the frame section;
a filter located outside of the frame section;
a valve frame contained in said enclosure and connected to the face sealing section;
an inhalation passage guiding inhalation air breathed through the filter via an inlet aperture in the frame section and an inhalation valve to the inside of the face sealing section, said inhalation valve being carried by the valve frame;
an exhalation passage guiding exhalation air from the inside of the face sealing section via an exhalation valve to the enclosure between the face sealing section and the frame section, said exhalation valve being carried by the valve frame; and exit outlets for the exhalation air guided in the enclosure to its rear ends towards the user's ear regions.
a frame section located outside of the face sealing section, defining an enclosure between the face sealing section and the frame section;
a filter located outside of the frame section;
a valve frame contained in said enclosure and connected to the face sealing section;
an inhalation passage guiding inhalation air breathed through the filter via an inlet aperture in the frame section and an inhalation valve to the inside of the face sealing section, said inhalation valve being carried by the valve frame;
an exhalation passage guiding exhalation air from the inside of the face sealing section via an exhalation valve to the enclosure between the face sealing section and the frame section, said exhalation valve being carried by the valve frame; and exit outlets for the exhalation air guided in the enclosure to its rear ends towards the user's ear regions.
2. The protective respirator as claimed in claim 1, characterized in that the top part of the respirator's frame section contains an air guidance plate that adapts itself to the contours of the face of the wearer and is oriented from the respirator's frame section toward the face of the wearer of the respirator.
3. The protective respirator as claimed in claim 1, characterized in that the exhalation air warms up a heat exchange surface of the frame section and at least one heat exchange ribbing of the frame section, said at least one heat exchange ribbing releasing heat from the exhalation air into the inhalation air.
4. The protective respirator as claimed in claim 1, characterized in that the exhalation air warms up an outer surface of the face sealing section keeping its inner temperature above dewpoint temperature and thus preventing the formation of condensated water inside the face sealing section.
5. The protective respirator as claimed in claim 1, characterized in that the frame section has at least one heat exchange ribbing, said at least one heat exchange ribbing forming grooves or cavities on a side of the frame section facing the filter.
6. The protective respirator as claimed in claim 2, characterized in that the exhalation air exits the respirator in a direction toward the filter with a heat exchange surface of the frame section and a guidance plate guiding the flow of the exhalation air.
7. The protective respirator as claimed in claim 1, characterized in that that the frame section has a heat exchange surface and at least one heat exchange ribbing, the heat exchange surface forming one wall of the enclosure, and the heat exchange surface being connected to said at least one heat exchange ribbing to form a contiguous piece.
8. The protective respirator as claimed in claim 7, characterized in that a side of the heat exchange surface facing the enclosure is comprised of longitudinal grooves and/or cavities advantageously opening toward the enclosure.
9. The protective respirator as claimed in claim 7, characterized in that the respirator further includes a lattice section positioned outside the frame section and that pressure equalising apertures are formed into the frame section and the lattice section outside and/or underneath the exhalation valve.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI912138A FI87047C (en) | 1991-05-02 | 1991-05-02 | Air exchange system for respiratory protection and respiratory protection |
| FI912138 | 1991-05-02 | ||
| PCT/FI1992/000137 WO1992019322A1 (en) | 1991-05-02 | 1992-04-30 | Protective respirator's air guidance system and protective respirator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2102296A1 CA2102296A1 (en) | 1992-11-03 |
| CA2102296C true CA2102296C (en) | 2004-08-10 |
Family
ID=8532436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002102296A Expired - Fee Related CA2102296C (en) | 1991-05-02 | 1992-04-30 | Protective respirator's air guidance system and protective respirator |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0582612B1 (en) |
| JP (1) | JP3438073B2 (en) |
| AT (1) | ATE146089T1 (en) |
| AU (1) | AU1655992A (en) |
| CA (1) | CA2102296C (en) |
| DE (1) | DE69215868T2 (en) |
| FI (1) | FI87047C (en) |
| WO (1) | WO1992019322A1 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2825758B2 (en) * | 1994-06-03 | 1998-11-18 | クリンテック株式会社 | Nose heat mask |
| DE19534985C2 (en) * | 1995-09-21 | 1998-02-12 | Auergesellschaft Gmbh | Respirator |
| EP0776679B1 (en) * | 1995-12-01 | 2002-04-10 | Ikari Corporation | Mask maintaining warmth in nasal area |
| US5924420A (en) * | 1996-09-24 | 1999-07-20 | Minnesota Mining And Manufacturing Company | Full face respirator mask having integral connectors disposed in lens area |
| US6279570B1 (en) * | 1999-03-02 | 2001-08-28 | 3M Innovative Properties Company | Filter support, assembly and system |
| ES2157775B1 (en) * | 1999-03-29 | 2002-02-16 | Gonzalez Andres Sanchez | MASTER RECOVERY OF BODY HEAT AND TEMPERATOR OF AIR TO BREATHE. |
| GB0112958D0 (en) * | 2001-05-29 | 2001-07-18 | F X K Patents Ltd | A pressure regulator |
| FI20011992A (en) | 2001-10-12 | 2003-04-13 | Euromaski Oy | Protective device |
| GB0411759D0 (en) * | 2004-05-26 | 2004-06-30 | Bu Innovations Ltd | Safety mask |
| CN104366755B (en) * | 2014-11-04 | 2017-01-18 | 朱其厚 | Active air supplying protection mouth muffle |
| CN207462475U (en) * | 2017-09-01 | 2018-06-08 | 皇家飞利浦有限公司 | The protective face mask of air pollutants |
| EP3479876A1 (en) * | 2017-11-02 | 2019-05-08 | Koninklijke Philips N.V. | Breathing mask |
| CN111315448B (en) * | 2017-09-01 | 2022-02-15 | 皇家飞利浦有限公司 | Breathing mask |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2741246A (en) * | 1954-12-17 | 1956-04-10 | George R Litchfield | Gas masks |
| FI69757C (en) * | 1983-08-23 | 1986-05-26 | Kauko Kullervo Haemaelaeinen | HALVMASK FOERSEDD MED EN FILTERBRYGGA |
| EP0258508B1 (en) * | 1986-09-05 | 1991-03-27 | Siebe North, Inc. | Replaceable filter respirator |
| JPH05509243A (en) * | 1990-06-04 | 1993-12-22 | エア―エイス オイ | mask |
-
1991
- 1991-05-02 FI FI912138A patent/FI87047C/en not_active IP Right Cessation
-
1992
- 1992-04-30 EP EP92909237A patent/EP0582612B1/en not_active Expired - Lifetime
- 1992-04-30 WO PCT/FI1992/000137 patent/WO1992019322A1/en active IP Right Grant
- 1992-04-30 AT AT92909237T patent/ATE146089T1/en not_active IP Right Cessation
- 1992-04-30 AU AU16559/92A patent/AU1655992A/en not_active Abandoned
- 1992-04-30 DE DE69215868T patent/DE69215868T2/en not_active Expired - Fee Related
- 1992-04-30 CA CA002102296A patent/CA2102296C/en not_active Expired - Fee Related
- 1992-04-30 JP JP50856992A patent/JP3438073B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3438073B2 (en) | 2003-08-18 |
| DE69215868D1 (en) | 1997-01-23 |
| FI912138A0 (en) | 1991-05-02 |
| FI87047C (en) | 1992-11-25 |
| WO1992019322A1 (en) | 1992-11-12 |
| AU1655992A (en) | 1992-12-21 |
| EP0582612A1 (en) | 1994-02-16 |
| JPH06506845A (en) | 1994-08-04 |
| FI912138A (en) | 1992-08-14 |
| CA2102296A1 (en) | 1992-11-03 |
| ATE146089T1 (en) | 1996-12-15 |
| EP0582612B1 (en) | 1996-12-11 |
| FI87047B (en) | 1992-08-14 |
| DE69215868T2 (en) | 1997-07-10 |
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