CA1114797A - Side lighting system for illuminating a task - Google Patents
Side lighting system for illuminating a taskInfo
- Publication number
- CA1114797A CA1114797A CA331,992A CA331992A CA1114797A CA 1114797 A CA1114797 A CA 1114797A CA 331992 A CA331992 A CA 331992A CA 1114797 A CA1114797 A CA 1114797A
- Authority
- CA
- Canada
- Prior art keywords
- task
- illuminating
- lighting system
- panels
- light source
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/0008—Reflectors for light sources providing for indirect lighting
- F21V7/0016—Reflectors for light sources providing for indirect lighting on lighting devices that also provide for direct lighting, e.g. by means of independent light sources, by splitting of the light beam, by switching between both lighting modes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
- F21W2131/40—Lighting for industrial, commercial, recreational or military use
- F21W2131/402—Lighting for industrial, commercial, recreational or military use for working places
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
SIDE LIGHTING SYSTEM FOR ILLUMINATING A TASK
ABSTRACT OF THE DISCLOSURE
A lighting system for illuminating a task comprising a housing with front and back panels whose inside surfaces are not highly reflective, side panels connectable to the front and rear panels, a bottom panel connectable to and shorter than the front and rear panels, preferably located in the center of the housing thereby creating apertures on either side, a connector for a light source intermediate from the side panels, preferably a single elongated high intensity gaseous discharge (HID) lamp transversely located in the center of the housing, and a reflecting means in the form of a polished or coated surface transversely located at the sides of the fixture to reflect luminous flux downward and inward. Thus, the task area is illuminated by indirect, side lighting and direct luminous flux is substantially eliminated. Ambient lighting is simultaneously produced through the upwardly open housing by direct and indirect luminous flux reflected upward by a reflecting means on or above the bottom panel, this luminous flux being reflected off the walls and the ceiling.
ABSTRACT OF THE DISCLOSURE
A lighting system for illuminating a task comprising a housing with front and back panels whose inside surfaces are not highly reflective, side panels connectable to the front and rear panels, a bottom panel connectable to and shorter than the front and rear panels, preferably located in the center of the housing thereby creating apertures on either side, a connector for a light source intermediate from the side panels, preferably a single elongated high intensity gaseous discharge (HID) lamp transversely located in the center of the housing, and a reflecting means in the form of a polished or coated surface transversely located at the sides of the fixture to reflect luminous flux downward and inward. Thus, the task area is illuminated by indirect, side lighting and direct luminous flux is substantially eliminated. Ambient lighting is simultaneously produced through the upwardly open housing by direct and indirect luminous flux reflected upward by a reflecting means on or above the bottom panel, this luminous flux being reflected off the walls and the ceiling.
Description
~147~!7 131\(~1i(;1~0~1NI) 01` Tlll` ] NVI:N'I' I ON
. . , _ . . _ . .
Field of tle Invention This invention relates to a liglltin~ system particularly designed to provide reduced glare task lighting by the indirect introduction of luminous flu~ from the side, while substantially eliminating direct luminous flux from being emitted toward the task area.
Descri tion of the Prior Art p One of the problems encountered with desk top or task lighting is that,the rearwardly directed rays of light from a light source rebound off the back wall or reflecting surface causing glare to the eyes of the worker addressing the task. A similar prob~em is encountered with the forward directed rays of light from the light source which rebound off the desk top or task being addressed, also causing glare to the eyes of the worker. A further problem concerns the desire to simultaneously provide general room or am~ient lighting. Ambient lighting has generally been provided by a light source separate from the task lighting source, with such lighting source being either a separate unit or housed ~ -in the same unit.
The broad concept of side lighting is taught in Ferree, et al., Patent No. 1,899,499, which requires a plurality of bulbs and uses a housing of considerably different structure than the disclosed invention.
Task/ambient lighting is taught by Shemitz, ~.S. Patent No. 4,054,793. The task lighting in this system is in a bat '~
; wing configuration that requires the use of refractors and prisms. The ambient light produced by'this system requires the use of a second light source that is necessarily linearly placed.
. . , _ . . _ . .
Field of tle Invention This invention relates to a liglltin~ system particularly designed to provide reduced glare task lighting by the indirect introduction of luminous flu~ from the side, while substantially eliminating direct luminous flux from being emitted toward the task area.
Descri tion of the Prior Art p One of the problems encountered with desk top or task lighting is that,the rearwardly directed rays of light from a light source rebound off the back wall or reflecting surface causing glare to the eyes of the worker addressing the task. A similar prob~em is encountered with the forward directed rays of light from the light source which rebound off the desk top or task being addressed, also causing glare to the eyes of the worker. A further problem concerns the desire to simultaneously provide general room or am~ient lighting. Ambient lighting has generally been provided by a light source separate from the task lighting source, with such lighting source being either a separate unit or housed ~ -in the same unit.
The broad concept of side lighting is taught in Ferree, et al., Patent No. 1,899,499, which requires a plurality of bulbs and uses a housing of considerably different structure than the disclosed invention.
Task/ambient lighting is taught by Shemitz, ~.S. Patent No. 4,054,793. The task lighting in this system is in a bat '~
; wing configuration that requires the use of refractors and prisms. The ambient light produced by'this system requires the use of a second light source that is necessarily linearly placed.
-2-~k `' 7~7 Therefore, a feature of the present invention is to provide improvement in reducing the glare incurred in task lighting caused by indirect or direct light reflecting from the *ask surface or the environs by introducing the luminous flux indirectly by reflection from the side and eliminating direct light.
Another feature of the invention is to provide improved ambient lighting in such a manner so as to substantially reduce possible glare in a task area.
Yet another feature of the invention is to provide an improvement in both *ask and ambient lighting from a single light source thereby saving energy.
SUMMARY.OF THE INVENTION
The invention embodiments disclosed herein include a light fixture for housing.a light source, the fixture and source being so combined as to provide task lighting from the side. Further, ambient lighting is simultaneously produced from the same light source.
The light fixture has front.and rear panels that are not -highly reflective on the inside, side panels that are highly reflective or specuIar on the inside positioned to reflect luminous flux downwardly and inwardly, or alternatively, reflectors proximately located to the side panels having similar highly reflective properties, and:a bottom panel considerably shorter than the front and rear panels connectable to the front .and rear panels preferably in the center of the fixture, thereby creating.an.aperture on each.side of the bottom panel. A light source is connectable intermed:iate from the side panels.and spaced apart therefrom, being.above the bottom panel, such light source preferably being an elongated high intensity gaseous discharge (HID) lamp, transversely and centrally located in the housing.
~5.147~'7 The luminous flux emitted by the li(Jht source strik~s the reflective surfaces on or proximate to the side panels and is reflected inwardly and downwardly through the ayertures to provide side lighting of the task area with reduced cJlare beneath the fixture since the downward ~mission of clircct light is prevented by the bottom panel. ~mbicnt lighting which is created from the light emitted througll tlle open top of the fixture directly from the light source is further supplemented by the use of a reflective means in the form of a polished or coated highly reflective or specular surface on the top of or proximately placed above the bottom panel and below the light source. The efficient use of reflectors or reflective surfaces and the system of side lighting provide excellent task and ambient lighting permitting the use of a single high intensity light source when tr,lnsversely - :
placed.
.
!' BRIEF DESCRIPTION OF THE DRAWINGS
! So that the manner in which the above-~ecited features, advantages and objects of the invention, as well as others which will become apparent, are at~ained and can be understood in detail, more particular description of the invention briefly summarized above may be had by reference to the embodiments thereof which are illustrated in the appended drawings, which drawings form a part of this specification.
It is to be noted, however, that the appended drawin~s illustrate only typical embodiments of the invention and are therefore not to be considered limiting of its scope, for the inven~ion may admit to other equally effective embodiments.
~L~14~'7 In the Drawings:
Fig. 1 is an obliquely portrayed pictorial illustration of a preferred embodiment of the invention disclosed herein.
Fig. 2 is an obliquely portrayed pictorial illustration of an alternate preferred embodiment of the invention disclosed herein.
Fig. 3 is a frontally portrayed pictorial illustration of the alternate preferred embodiment of the invention disclosed herein.
Fig. 4 is a downward view of the top of the invention disclosed herein.
Fig. 5 is an upward view of the bottom of the invention disclosed herein.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to Fig. 1 of the drawings, a lighting fixture 11 is illustrated as being mounted by means (not shawn) above a work or task area such as a desk 20. The hausing of the light fixture, preferably elongated in shape, has a front panel 15 and a back panel 16, two side panels-13, and a partial bottom panel 18. A light source 19 is transversely situated preferably in the center of the light fixture.
Front panel 15 and back panel 16 have inside surfaces that are not highl~ reflective. These non-reflective surfaces may be obtained by various known methads su~h as coating the surface with, or constructing the panel of, materials which are inherently non-reflective. Two side panels 13 have inside surfaces that are highly reflective or specular. These highly reflective surfaces may also be obtained by various known methods such as coating the surface with, covering or constructing the panel of, materials which are inherently highly reflective. These side panels are constructed so as to slant inward as they progress upward. Bottom panel - . , . ~, ': ', . .
~47~7 17 is the same width as side panels 13, but shorter in length than front panel 15 and rear pancl 16, to which th~y are connected. The bottom panel is preEer.lbly located in the center of the housing thereby creatincJ two aperturcs 1 of equal siz~ on either side thereof, and next to side panels 13. This bottom panel can also have a highly reflcctive top surface.
Fig. 1 also illustrates a single light source, preferably an HID lamp, connectably located transversely in the center of the housing. Luminous flux 21-23 is emitted from the light source. The essentially longitudinally emitted luminous flux 21 is reflected downwardly and inwardly by the highly reflective side panels, passing through the apertures, thereby providing indirect side illumination for the task area. Light source 19 also emits luminous flux 22 upward to exit the fixture through the opening across the top and is - reflected by the walls and the ceiling to provide ambient , lighting. Downwardly directed luminous flux 23 that would otherwise directly light task area 20 i5 prevented from exiting the housing through the bottom by bottom panel 17.
This downwardly emitted luminous flux 23 is instead upwardly reflected by the highly reflective or specular'surface of the,bottom panel to provide ambient lighting in the same manner as the direct luminous flux upwardly emitted. A top panel could also be added which contains one or more diffusion lenses or refractors that assist in directing upwardly exiting luminous flux.
Fig. 2 illustrates an alternate preferred embodiment of the invention wherein housing 31 is essentially rectangular.
Front panel 35 and rear panel 36 are not highly reflective on the inside. Bottom panel 37 has an upper surface of substantially highly reflective or specular material and is ~47~7 shorter than and connected to front panel 35 and rear panel 36.
The bottom panel is centrally located and two side panels 33 are connected to front panel 35 and rear panel 36. Light source 39 is intermediate from side panels 33 and spaced apart therefrom, being transversely located above bottom panel 37. Highly reflective or specuIar reflectors 32 are proximately located .: :
next to side panels 33 and slanted inwardly and upwardly. The resuIt is the same as in Fig. 1 in that luminous fluxes 41, 42 and 43 are reflected respectively inwardly and downwardly by the reflectors 32, directly upward,.and indirectly upward by reflection from bottom panel 37.
Fig. 3 is a front view of a preferred embodiment of the invention, clearly illustrating luminous flux 21 being reflected by the reflectors 12 inwardly and downwardly to produce the task illumination from the side, and luminous flux 22 and reflected ~ -luminous flux 23 that produces the.ambient lighting. A top view, Fig. 4, and.a bottom view, Fig. 5, show the transversely centrally placed elongated light source, the central location of -bottom panel 17.and equal sized.apertures 14 on either side of the bottom panel. -While particuIar embodiments of the invention have been shown.and described, it.will be understood that the invention is not limited thereto, since many modifications may be made and will become apparent to those skilled in the.art. For example, the bottom panel couId be.attached to one side thereby creating only one side.aperture, or could have.a small.attachment to one or both sides leaving only.a part:ial side opening where such .attachment is made,.and still.achieve the side task lighting effect described:above.with respect to the preferred embodiments.
Another feature of the invention is to provide improved ambient lighting in such a manner so as to substantially reduce possible glare in a task area.
Yet another feature of the invention is to provide an improvement in both *ask and ambient lighting from a single light source thereby saving energy.
SUMMARY.OF THE INVENTION
The invention embodiments disclosed herein include a light fixture for housing.a light source, the fixture and source being so combined as to provide task lighting from the side. Further, ambient lighting is simultaneously produced from the same light source.
The light fixture has front.and rear panels that are not -highly reflective on the inside, side panels that are highly reflective or specuIar on the inside positioned to reflect luminous flux downwardly and inwardly, or alternatively, reflectors proximately located to the side panels having similar highly reflective properties, and:a bottom panel considerably shorter than the front and rear panels connectable to the front .and rear panels preferably in the center of the fixture, thereby creating.an.aperture on each.side of the bottom panel. A light source is connectable intermed:iate from the side panels.and spaced apart therefrom, being.above the bottom panel, such light source preferably being an elongated high intensity gaseous discharge (HID) lamp, transversely and centrally located in the housing.
~5.147~'7 The luminous flux emitted by the li(Jht source strik~s the reflective surfaces on or proximate to the side panels and is reflected inwardly and downwardly through the ayertures to provide side lighting of the task area with reduced cJlare beneath the fixture since the downward ~mission of clircct light is prevented by the bottom panel. ~mbicnt lighting which is created from the light emitted througll tlle open top of the fixture directly from the light source is further supplemented by the use of a reflective means in the form of a polished or coated highly reflective or specular surface on the top of or proximately placed above the bottom panel and below the light source. The efficient use of reflectors or reflective surfaces and the system of side lighting provide excellent task and ambient lighting permitting the use of a single high intensity light source when tr,lnsversely - :
placed.
.
!' BRIEF DESCRIPTION OF THE DRAWINGS
! So that the manner in which the above-~ecited features, advantages and objects of the invention, as well as others which will become apparent, are at~ained and can be understood in detail, more particular description of the invention briefly summarized above may be had by reference to the embodiments thereof which are illustrated in the appended drawings, which drawings form a part of this specification.
It is to be noted, however, that the appended drawin~s illustrate only typical embodiments of the invention and are therefore not to be considered limiting of its scope, for the inven~ion may admit to other equally effective embodiments.
~L~14~'7 In the Drawings:
Fig. 1 is an obliquely portrayed pictorial illustration of a preferred embodiment of the invention disclosed herein.
Fig. 2 is an obliquely portrayed pictorial illustration of an alternate preferred embodiment of the invention disclosed herein.
Fig. 3 is a frontally portrayed pictorial illustration of the alternate preferred embodiment of the invention disclosed herein.
Fig. 4 is a downward view of the top of the invention disclosed herein.
Fig. 5 is an upward view of the bottom of the invention disclosed herein.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to Fig. 1 of the drawings, a lighting fixture 11 is illustrated as being mounted by means (not shawn) above a work or task area such as a desk 20. The hausing of the light fixture, preferably elongated in shape, has a front panel 15 and a back panel 16, two side panels-13, and a partial bottom panel 18. A light source 19 is transversely situated preferably in the center of the light fixture.
Front panel 15 and back panel 16 have inside surfaces that are not highl~ reflective. These non-reflective surfaces may be obtained by various known methads su~h as coating the surface with, or constructing the panel of, materials which are inherently non-reflective. Two side panels 13 have inside surfaces that are highly reflective or specular. These highly reflective surfaces may also be obtained by various known methods such as coating the surface with, covering or constructing the panel of, materials which are inherently highly reflective. These side panels are constructed so as to slant inward as they progress upward. Bottom panel - . , . ~, ': ', . .
~47~7 17 is the same width as side panels 13, but shorter in length than front panel 15 and rear pancl 16, to which th~y are connected. The bottom panel is preEer.lbly located in the center of the housing thereby creatincJ two aperturcs 1 of equal siz~ on either side thereof, and next to side panels 13. This bottom panel can also have a highly reflcctive top surface.
Fig. 1 also illustrates a single light source, preferably an HID lamp, connectably located transversely in the center of the housing. Luminous flux 21-23 is emitted from the light source. The essentially longitudinally emitted luminous flux 21 is reflected downwardly and inwardly by the highly reflective side panels, passing through the apertures, thereby providing indirect side illumination for the task area. Light source 19 also emits luminous flux 22 upward to exit the fixture through the opening across the top and is - reflected by the walls and the ceiling to provide ambient , lighting. Downwardly directed luminous flux 23 that would otherwise directly light task area 20 i5 prevented from exiting the housing through the bottom by bottom panel 17.
This downwardly emitted luminous flux 23 is instead upwardly reflected by the highly reflective or specular'surface of the,bottom panel to provide ambient lighting in the same manner as the direct luminous flux upwardly emitted. A top panel could also be added which contains one or more diffusion lenses or refractors that assist in directing upwardly exiting luminous flux.
Fig. 2 illustrates an alternate preferred embodiment of the invention wherein housing 31 is essentially rectangular.
Front panel 35 and rear panel 36 are not highly reflective on the inside. Bottom panel 37 has an upper surface of substantially highly reflective or specular material and is ~47~7 shorter than and connected to front panel 35 and rear panel 36.
The bottom panel is centrally located and two side panels 33 are connected to front panel 35 and rear panel 36. Light source 39 is intermediate from side panels 33 and spaced apart therefrom, being transversely located above bottom panel 37. Highly reflective or specuIar reflectors 32 are proximately located .: :
next to side panels 33 and slanted inwardly and upwardly. The resuIt is the same as in Fig. 1 in that luminous fluxes 41, 42 and 43 are reflected respectively inwardly and downwardly by the reflectors 32, directly upward,.and indirectly upward by reflection from bottom panel 37.
Fig. 3 is a front view of a preferred embodiment of the invention, clearly illustrating luminous flux 21 being reflected by the reflectors 12 inwardly and downwardly to produce the task illumination from the side, and luminous flux 22 and reflected ~ -luminous flux 23 that produces the.ambient lighting. A top view, Fig. 4, and.a bottom view, Fig. 5, show the transversely centrally placed elongated light source, the central location of -bottom panel 17.and equal sized.apertures 14 on either side of the bottom panel. -While particuIar embodiments of the invention have been shown.and described, it.will be understood that the invention is not limited thereto, since many modifications may be made and will become apparent to those skilled in the.art. For example, the bottom panel couId be.attached to one side thereby creating only one side.aperture, or could have.a small.attachment to one or both sides leaving only.a part:ial side opening where such .attachment is made,.and still.achieve the side task lighting effect described:above.with respect to the preferred embodiments.
Claims (7)
1. A side lighting system -for illuminating a task comprising a housing having front and rear panels whose inner surfaces are not highly reflective, two side panels connectable to the front and rear panels, a bottom panel connectable to the front and rear panels, but shorter than the front and rear panels thereby creating at least one aperture between the bottom panel and side panel, at least one light source connectable to said housing so that said bottom panel shields said light source from directly illuminating the task, said light source being intermediate from said side panels and spaced apart therefrom, and at least one of said side panels adjacent the created aperture directing reflected luminous flux inwardly and downwardly from said one of said side panels through the aperture.
2. A side lighting system for illuminating a task as described in Claim 1, wherein said light source described is a single elongated lamp, its elongated dimension being transverse to said front and rear panels in the housing.
3. A side lighting system for illuminating a task as described in Claim 1, wherein said light source described is a high intensity gaseous discharge lamp
4. A side lighting system for illuminating a task as described in Claim 1, wherein at least a substantial portion of the top surface of said bottom panel is highly reflective.
5. A side lighting system for illuminating a task as described in Claim 1, wherein the reflecting means described is a reflector.
6. A side lighting system for illuminating a task as described in Claim 1, wherein a substantial portion of the inner surface of each of said side panels is highly reflective, thereby functioning as said reflecting means.
7. A side lighting system for illuminating a task as described in Claim 1, wherein said aperture is located adjacent said reflecting means to permit reflected light therefrom to be directed directly toward the task.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US94976278A | 1978-10-10 | 1978-10-10 | |
| US949,762 | 1978-10-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1114797A true CA1114797A (en) | 1981-12-22 |
Family
ID=25489519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA331,992A Expired CA1114797A (en) | 1978-10-10 | 1979-07-17 | Side lighting system for illuminating a task |
Country Status (8)
| Country | Link |
|---|---|
| AU (1) | AU5143179A (en) |
| BE (1) | BE879201A (en) |
| CA (1) | CA1114797A (en) |
| DE (1) | DE2936054A1 (en) |
| ES (1) | ES256583Y (en) |
| FR (1) | FR2438791A1 (en) |
| GB (1) | GB2032606B (en) |
| IT (1) | IT7949846A0 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3030080C2 (en) * | 1980-08-08 | 1984-10-18 | Siemens AG, 1000 Berlin und 8000 München | Elongated workplace lamp |
| DE8128057U1 (en) * | 1981-09-25 | 1982-01-28 | Bron Elektronik AG, 4123 Allschwil, Basel | "LAMP" |
| DE3603152A1 (en) * | 1986-02-01 | 1986-10-09 | Gustav 5802 Wetter Illguth | Base for luminaires |
| DE3610511A1 (en) * | 1986-03-26 | 1987-10-01 | Sill Franz Gmbh | Indirectly emitting light, in particular for a high-pressure discharge lamp |
| EP0697560B1 (en) * | 1994-08-17 | 1996-12-27 | Siemens Aktiengesellschaft | Elongated indoor light fixture for lighting a work station |
| DE19917026A1 (en) * | 1999-04-15 | 2000-10-26 | Wila Leuchten Ag Sevelen | Workplace-related pendant lamp |
| CN107830445A (en) * | 2017-12-11 | 2018-03-23 | 苏州承腾电子科技有限公司 | Desk with light fixture |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB457863A (en) * | 1935-06-05 | 1936-12-07 | George Victor Downer | Improvements in or relating to illuminating devices |
| US3239659A (en) * | 1963-06-14 | 1966-03-08 | Polaroid Corp | Glare-reducing lamp |
| FR1399822A (en) * | 1964-05-16 | 1965-05-21 | Pelton & Crane Company | Lighting device for dental and surgical operations |
-
1979
- 1979-07-17 CA CA331,992A patent/CA1114797A/en not_active Expired
- 1979-07-24 IT IT7949846A patent/IT7949846A0/en unknown
- 1979-08-15 GB GB7928362A patent/GB2032606B/en not_active Expired
- 1979-09-06 DE DE19792936054 patent/DE2936054A1/en not_active Withdrawn
- 1979-09-10 ES ES1979256583U patent/ES256583Y/en not_active Expired
- 1979-09-28 FR FR7925386A patent/FR2438791A1/en not_active Withdrawn
- 1979-10-03 AU AU51431/79A patent/AU5143179A/en not_active Abandoned
- 1979-10-04 BE BE0/197474A patent/BE879201A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| IT7949846A0 (en) | 1979-07-24 |
| AU5143179A (en) | 1980-04-17 |
| ES256583Y (en) | 1981-12-16 |
| DE2936054A1 (en) | 1980-04-30 |
| ES256583U (en) | 1981-07-01 |
| GB2032606A (en) | 1980-05-08 |
| GB2032606B (en) | 1982-12-08 |
| BE879201A (en) | 1980-02-01 |
| FR2438791A1 (en) | 1980-05-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |