GB2266673A - Pleated filter - Google Patents

Pleated filter Download PDF

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Publication number
GB2266673A
GB2266673A GB9308476A GB9308476A GB2266673A GB 2266673 A GB2266673 A GB 2266673A GB 9308476 A GB9308476 A GB 9308476A GB 9308476 A GB9308476 A GB 9308476A GB 2266673 A GB2266673 A GB 2266673A
Authority
GB
United Kingdom
Prior art keywords
filter
piece
frame
spokes
frame parts
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.)
Granted
Application number
GB9308476A
Other versions
GB9308476D0 (en
GB2266673B (en
Inventor
Kai Henrik Haeppoelae
Marko Tapio Kangasniemi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Finn Filter Oy
Original Assignee
Finn Filter Oy
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Finn Filter Oy filed Critical Finn Filter Oy
Priority to GB9410876A priority Critical patent/GB2276835B/en
Publication of GB9308476D0 publication Critical patent/GB9308476D0/en
Publication of GB2266673A publication Critical patent/GB2266673A/en
Application granted granted Critical
Publication of GB2266673B publication Critical patent/GB2266673B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
    • B01D29/05—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements supported
    • B01D29/07—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements supported with corrugated, folded or wound filtering sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B01D29/15—Supported filter elements arranged for inward flow filtration
    • B01D29/21—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B01D29/23—Supported filter elements arranged for outward flow filtration
    • B01D29/232—Supported filter elements arranged for outward flow filtration with corrugated, folded or wound sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/96—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor in which the filtering elements are moved between filtering operations; Particular measures for removing or replacing the filtering elements; Transport systems for filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0001—Making filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
    • B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/12—Pleated filters

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Filtering Materials (AREA)

Abstract

A filter comprises a section of pleated filter fabric 2 clamped between detachable frame members 3, 4, profiled to maintain the pleated shape. The fabric is replaced when clogged. Fig. 1 shows rectangular frame members with rods 7, 8 round which the fabric 2 is extended. In manufacture the fabric 2 is drawn from a roll and held at one end while rods 8 are successively lowered to form successive pleats (Fig. 2). Rods 8 may extend between two levers pivoted to frame member 3 (Fig. 3) to facilitate this process. In Figs. 6-8 a preformed frusto-conical pleated filter paper sleeve is removably clamped between end fittings, each composing inner and outer rings with matching sets of teeth. <IMAGE>

Description

2266673 Filter and a method for the construction thereof The present
invention relates to a filter which comprises frame parts and, attached to bear on them, a piece of web-like filter medium in which pleats have been formed in order to increase the filter surface area.
In present-day filters, the web of filter medium and the frame supporting it usually constitute one continuous element which can be replaced at the stage when the web has become clogged or otherwise exhausted. The filter medium web, which is typically of paper or of non-woven polymer fiber, is in these filters attached to a frame of plastic or metal by gluing or in connection with extrusion, or by the so-called Hot Melt technique. Such replaceable filter elements have been used, for example, for filtering the suction air in automobile engines and in fresh-air conduits leading into the interior spaces of an automobile.
In a filter element in which the frame, the filter medium web and possibly a gasket are integrally of one piece, the separation-and recycling of the materials is in practice impossible. Thus, when exhausted, the element in its entirety ends up as waste. In certain cases it has to be treated as problem waste. The large proportion of frame parts in the waste material amount to be treated is in this case an evident disadvantage.
The present invention aims to improve the prior-art technique so that the materials of the filter can be recycled, in which case waste difficult to treat will be produced in smaller auantities than previously. The filter according to the invention is characterized in that the edges of the web-like piece of filter medium can be inserted between two frame parts detachably fastened to each other, the profiles of the frame 2 part edges brought against the filter piece corresponding to the pleating of the filter piece.
What is accomplished by means of the invention is that, when a piece of filter medium has become clogged, it is not necessary to destroy the whole filter; replacing the filter medium with a new medium will suffice. The edges of the detachable frame parts can be equipped with a band-like rubber gasket which provides the filter with sufficient sealing.
The filter according to the invention may comprise a sheet-like filter piece and a surrounding frame, which is, for example, rectangular. Corrugation corresponding to the pleating of the filter piece can be formed on two opposite sides of the rectangular frame parts, while the other two sides of the frame marts are left straight. On the other hand, the filter may even have some other shape, depending on the cross sectional shape of the flow channel in which it is the intention install the filter.
The filter medium piece to be used in the filter according the invention may be of a material which can be pleated by folding, such as paper, nonwoven polymer fiber, or the like. Such filter pieces can be prefabricated for filter replacements.
It is also possible that the filter piece is of a flimsy, flexible material, such as textile or non-woven fabric, and that to the frame of the filter there are connected spokes which will retain the filter piece in corrugation-like pleats. In this case the filter piece is brought by means of the spokes into pleats while the filter piece is being fitted in place against one frame part. When the filter piece has been pleated in place, the frame parts are fastened to each other so that the filter piece edges and the ends of the spokes remain between these parts.
According to the invention, the filter piece may also be cylin- 3 drical or conical and be fastened by its opposite ends between two frame parts which are one inside the other. These frame parts, at each end of the filter piece, may each be made up of a flat part profiled in accordance with the pleating of the filter piece and of a ring-like part surrounding it and having a corresponding profile an its inner edge.
The invention further relates to a method for constructing in particular a filter in which the filter piece is of a flimsy, flexible material, such as textile fabric. The method is characterized in that on a lower frame part, the upper edges of two opposite sides of which are corrugated and which is equipped at the tips of the corrugations with cross-spokes interconnecting the sides of the part, there is placed to bear on the crossspokes a web of filter medium, which is fastened to one end of the frame part, that the filter medium web is thereafter bent into corrugation-like pleats by means of separate cross-spokes which are pressed against the bottoms of the recesses between the corrugations on the sides of the said frame part, and ultimately an upper frame part, corrugated at the lower edges of its opposite sides in a corresponding manner, is introduced against the lower frame part in such a manner that the edges of the filter medium web will remain between the frame part sides pressing against each other.
The filter medium web used may be fabricated as a continuous band, which is fed onto the cross-spokes of the lower frame part, is attached to one end of the said frame part, and is cut at the opposite end of the frame while the lower part and the upper part are being brought against each other. The web may be bent into pleats, one pleat at a time, by using separate crossspokes or alternatively by using cross-spokes the ends of which are connected to the two opposite sides of the frame, on pivatally mounted rods.
Respectively it is conceivable that, when pivotally mounted 4 cross-spokes are used, the filter medium can be fed from a roll and be collected after use at the opposite end, also on a roll, and that it can be also fed mechanically or by motor drive, even so that the feeding takes place automatically after the filter medium has been exhausted.
The invention is described below in greater detail with the help of examples, with reference to the accompanying drawings, in which Figure 1 depicts a filter according to the invention, in which a filter piece made of-textile fabric has been fastened between two opposite rectangular frame parts, Figure 2 depicts the pleating of the filter fabric by means of separate cross-spokes in the filter according to Figure 1, Figure 3 depicts the pleating of the filter fabric by means of cross-spokes connected to rods, in another filter according to the invention, Figure 4 depicts a cross section through IV-IV of the filter according to Figure 3, at a stage at which the filter fabric has been pleated but the frame parts have not yet been brought against each other, Figure 5 depicts one filter according to the invention, in which a pre-pleated filter piece of paper has been fastened between two opposite rectangular frame parts, Figure 6 depicts a filter according to the invention, in which both ends of a pre-pleated conical filter piece have been fastened between two frame parts which are one inside the other, Figure 7 depicts a filter piece belonging to the filter according to Figure 6, and Figure 8 depicts the end of a filter according to Figure 6, in section through VIII-VIII in Figure 6.
Figure 1 shows a rectangular filter 1, which comprises a filter medium piece 2 of a flexible fabric, bent into corrugation-like pleats and fastened by its edges between lower and upper frame parts 3, 4. The upper edges 5 of the longitudinal sides of the lower frame part 3 and the lower edges 6 of the longitudinal sides of the upper frame part 4 are corrugated to correspond to each other and to the pleating of the filter fabric 2. At the. tips of the corrugations of the filter fabric 2 there are arranged spokes 7, 8 extending across the filter, the spokes ensuring that the fabric will remain in pleats.
In the filter 1 according to Figure 1, the frame parts 3, 4 can be detached from each other for the replacement of a filter fabric 2 which has been exhausted. In connection with the replacement, fresh filter fabric 2 is fed as a continuous band from a roll 9 onto the spokes 7 extending across the filter at the tips of the corrugations of the lower frame part 3, and are fastened to the end 10 of the said frame part. Thereafter the filter fabric 2 is bent, one corrugation at a time, into pleats by means of freely movable cross-spokes 8, which can be pressed down from above into the recesses between the corrugations of the lower frame part. The pleating is illustrated in Figure 2, which shows three freely movable cross-spokes 8 at three different stages of pleat forming. After the whole filter fabric 2 has been pleated, the frame parts 3, 4 are brought against each other, and at the same time a cutting blade 11 in the upper frame part cuts the filter fabric. Those edges of the frame parts 3, 4 which are brought against each other.can be equipped with rubber gaskets which encircle the parts and will prevent leaks at the joints between the filter fabric and the frame parts.
The embodiment of the invention shown Figures 3 and 4 corresponds largely to that shown in Figures 1 and 2. There is, however, the difference that the ends of the cross-spokes 8 which bend the filter fabric 2 into pleats are connected to rods 12 pivotally mounted on the opposite longitudinal sides of the lower frame part 3. When the rods 12 pivot, the spokes 8 will begin to pleat the filter fabric 2, starting from that end 10 of the frame part 3 to which the end of the fabric has been fastened, but ultimately all of the pleats of the fabric are 6 completed simultaneously. This stage is depicted in Figure 4, in which the rods 12 with the spokes 8 have pivoted to their lower position.
In the filter 1 according to Figure 5, the filter piece 13 is a sheet of paper pleated by folding, placed between frame parts 3, 4 the edges of which are toothed so as ta correspond to the pleating. Since the paper sheet 13 has pleated in advance, spokes extending across the filter are unnecessary in this embodiment.
Figures 6-8 depict an embodiment of the invention in which the filter 1 and the pleated paper filter piece 14 belonging to it are conical in their basic shape. The conical filter piece 14, which has been pleated and seamed in advance, is shown in Figure 7. The frame parts are made up, in accordance with Figures 6 and 8, at each end 15, 16 of the filter piece 14, of a platelike part 17, 17' profiled at its outer edge according to the pleating of the filter piece and of a ring-like part 18, 181 surrounding it, correspondingly profiled on its inner edge. The inner frame part 17 of the upper end 15 of the filter piece and the outer frame part 181 of the lower end 16 of the filter piece are interconnected by a shaft 19 passing through the filter piece. The installing of the filter piece 14 in place is done while the outer frame part 18 of the upper end 15 of the piece and the inner frame part 17' of the lower end are detached. Thereafter the frame parts 17, 18; 171, 181, the opposite edges of which are, in relation to the shaft 19, at a slant corresponding to the tapering of the cone, are tightened against the ends 15, 16 of the filter piece and each other by means of tightening nuts 20, 21 at the ends of the shaft, the tightening being based on a mutual axial movement of the slanted surfaces of the edges.
In accordance with the arrows in Figure 6, the air flow to be filtered is from the outside to the inside of the conical fil- 7 ter piece 14, from where the filtered air continues its travel into the outlet opening 22 in the flat inner frame part 17 at the lower end 16 of the filter piece. A flow in the opposite direction would, of course, be equally possible.
For an expert in the art it is clear that the various embodiments of the invention are not limited to the examples presented above but may vary within the accompanying patent claims. For example, the filter medium may be not only textile fabric or paper but also fiberglass mesh or viscose fiber pulp or other non-woven fiber, which may be placed between two layers of paper. The last-mentioned material is suitable, for example, in automobiles for fresh-air filters which remove dust from the air entering the interior spaces of the automobile. The filter according to the invention is suitable for filtering not only gases but also liquids, for example as an oil filter.
8

Claims (13)

Claims
1. A filter (1) which comprises frame parts (3, 4; 17, 18) and a piece (2, 13, 14) of a web-like filter medium fastened to bear on them, pleats having been formed in the filter piece for increasing the filter surface area, characterized in that the edges of the filter piece (2, 13, 14) have been inserted between two detachably interconnected frame parts (3, 4; 17, 18), those edges (5, 6) of the frame parts which are brought against the filter piece having profiles which correspond to the pleating of the filter piece.
2. A filter according to Claim 1, characterized in that the filter (1) comprises a sheet-like filter piece (2, 13) and a frame (3, 4) surrounding it.
3. A filter according to Claim 2, characterized in that the filter piece (2, 13) and the frame (3, 4) are substantially rectangular.
4. A filter according to any of the above claims, characterized in that the filter piece (13) is of a material which can be pleated by folding, such as paper.
5. A filter according to Claim 2 or 3, characterized in that the filter piece (2) is of flimsy, flexible material, such as textile fabric, and that to the frame (3, 4) there are connected spokes (7, 8) extending across the filter piece, the spokes holding the filter piece in corrugation-like pleats.
6. A filter according to Claim 1, characterized in that the filter piece (14) is cylindrical or conical and is attached at its opposite ends (15, 16) between two frame parts (17, 18) which are one inside the other.
7. A filter according to Claim 6, characterized in that the frame parts are made up, at each end (15, 16) of the filter 9 piece (14), of a plate-like part (17) having an outer edge profiled according to the pleating of the filter piece and of a ring-like part (18) surrounding it and having a corresponding profiling on its inner edge.
8. A filter according to Claim 6 or 7, characterized in that the end (15, 16) of the conical filter piece (14) is fastened between frame parts (17, 18) pressed against each other in a wedge-like manner in the direction of the axis (19) of the cone.
9. A method for constructing a filter according to Claim 5, characterized in that an the lower frame part (3), the upper edges (5) of two opposite sides of which are corrugated and which is equipped at the tips of the corrugations with crossspokes (7) interconnecting the sides of the part, there is placed, to bear on the cross-spokes, a filter medium sheet (2) which is fastened to one end (10) of the frame part, that the filter medium web is thereafter bent into corrugation71ike pleats by means of separate cross-spokes (8), which are pressed against the bottoms of the recesses between the corrugations on the sides of the said frame part, and that against the lower frame part there is ultimately introduced the upper frame part (4), corrugated in a corresponding manner on the lower edges (6) of its opposite sides, in such a manner that the edges of the filter medium web will remain between the sides of the frame parts (3, 4) pressing against each other.
10. A method according to Claim 9, characterized in that the filter medium web (2) is fed from a roll (9) as a continuous band onto the cross- spokes of the lower frame part (3), is fastened to one end (10) of the said frame part, and is cut at the opposite end of the frame at the same time as the upper and the lower frame parts (3, 4) are brought against each other.
0
il. method acco--d-.-.g to Cl-aim 9 or 10, characterized in ..,.az the bending of 41ter medium web (2) is carried cut -v- means of c-ross-spakes (8) the ends of which are connected to rods (12) pivotall-7 mounted an the two opposite sides of the Irame (3).
12. A filter susbtantially as herein described and as illustrated in the accompanying drawings.
13. A method for constructing-a filter substantially as herein described with reference to the accompanying drawings.
GB9308476A 1992-05-08 1993-04-23 Filter and a method for the construction thereof Expired - Fee Related GB2266673B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9410876A GB2276835B (en) 1992-05-08 1993-04-23 Filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI922108A FI91219C (en) 1992-05-08 1992-05-08 Filters and process for its construction

Publications (3)

Publication Number Publication Date
GB9308476D0 GB9308476D0 (en) 1993-06-09
GB2266673A true GB2266673A (en) 1993-11-10
GB2266673B GB2266673B (en) 1995-09-20

Family

ID=8535260

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9308476A Expired - Fee Related GB2266673B (en) 1992-05-08 1993-04-23 Filter and a method for the construction thereof

Country Status (4)

Country Link
DE (1) DE4313913A1 (en)
FI (1) FI91219C (en)
GB (1) GB2266673B (en)
SE (2) SE9301301L (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0824950A1 (en) * 1996-08-13 1998-02-25 Firma Carl Freudenberg Filter insert and process for its production
GB2327624A (en) * 1997-07-26 1999-02-03 Lucas Ind Plc Pleated filter elements
DE102014002159A1 (en) * 2014-02-19 2015-08-20 Mann + Hummel Gmbh Filter element for a filter device
CN111033074A (en) * 2017-09-08 2020-04-17 曼·胡默尔有限公司 Brake dust particle filter and disc brake assembly comprising a brake dust particle filter
CZ309991B6 (en) * 2023-08-08 2024-04-17 ATREA Group a.s. A tight air handling filter

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU6532996A (en) * 1996-06-19 1998-01-07 Moon Chan Park Apparatus and method for continuously purifying gas with continuously cleaning filter, and package-type filter
DE29619224U1 (en) * 1996-11-06 1998-03-05 Melitta Haushaltsprodukte GmbH & Co. KG, 32427 Minden Filter device for the production of aroma extracts from coffee or tea
ITBO20010369A1 (en) * 2001-06-11 2002-12-11 Bmc Srl SINGLE BODY FILTERING DEVICES FOR THE AIR SUPPLY OF COMBUSTION ENGINES
DE10131422C2 (en) * 2001-06-29 2003-05-08 Sandler Helmut Helsa Werke Filter element with a pleated filter pack
DE202005014082U1 (en) * 2005-09-06 2007-01-11 Mann + Hummel Gmbh Modular filter for incorporation into user installation, e.g. transport vehicle, comprises two part mounting for filter element

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB499914A (en) * 1936-12-17 1939-01-31 American Air Filter Co Improvements in or relating to air filter units
GB1197172A (en) * 1966-06-07 1970-07-01 Davis Ind Equipment Company Lt Improvements in and relating to Filters
GB1273251A (en) * 1968-02-01 1972-05-03 Carborundum Co Replaceable medium, extended area filter unit
GB2022436A (en) * 1978-06-06 1979-12-19 Schumacher Nihon Kk A filter with a tubular filter element

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB499914A (en) * 1936-12-17 1939-01-31 American Air Filter Co Improvements in or relating to air filter units
GB1197172A (en) * 1966-06-07 1970-07-01 Davis Ind Equipment Company Lt Improvements in and relating to Filters
GB1273251A (en) * 1968-02-01 1972-05-03 Carborundum Co Replaceable medium, extended area filter unit
GB2022436A (en) * 1978-06-06 1979-12-19 Schumacher Nihon Kk A filter with a tubular filter element

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0824950A1 (en) * 1996-08-13 1998-02-25 Firma Carl Freudenberg Filter insert and process for its production
GB2327624A (en) * 1997-07-26 1999-02-03 Lucas Ind Plc Pleated filter elements
DE102014002159A1 (en) * 2014-02-19 2015-08-20 Mann + Hummel Gmbh Filter element for a filter device
CN111033074A (en) * 2017-09-08 2020-04-17 曼·胡默尔有限公司 Brake dust particle filter and disc brake assembly comprising a brake dust particle filter
CZ309991B6 (en) * 2023-08-08 2024-04-17 ATREA Group a.s. A tight air handling filter

Also Published As

Publication number Publication date
GB9308476D0 (en) 1993-06-09
FI922108A0 (en) 1992-05-08
SE9301301L (en) 1993-11-09
GB2266673B (en) 1995-09-20
FI922108A (en) 1993-11-09
SE9301301D0 (en) 1993-04-21
SE9500772L (en) 1900-01-01
SE9500772A0 (en) 1995-03-03
FI91219C (en) 1994-06-10
FI91219B (en) 1994-02-28
DE4313913A1 (en) 1993-11-11
SE9500772D0 (en) 1995-03-03

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732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19970423