EP1051232A1 - Filter element for mounting in a filter housing - Google Patents

Filter element for mounting in a filter housing

Info

Publication number
EP1051232A1
EP1051232A1 EP98945109A EP98945109A EP1051232A1 EP 1051232 A1 EP1051232 A1 EP 1051232A1 EP 98945109 A EP98945109 A EP 98945109A EP 98945109 A EP98945109 A EP 98945109A EP 1051232 A1 EP1051232 A1 EP 1051232A1
Authority
EP
European Patent Office
Prior art keywords
filter element
filter
frame elements
frame
cover
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.)
Withdrawn
Application number
EP98945109A
Other languages
German (de)
French (fr)
Inventor
Arthur Klotz
Klaus Lieb
Hermann Maurer
Karl-Heinz Messner
Wolfgang Oberknapp
Steffen Schneider
Bruno Sommer
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.)
Mann and Hummel GmbH
Original Assignee
Filterwerk Mann and Hummel GmbH
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 Filterwerk Mann and Hummel GmbH filed Critical Filterwerk Mann and Hummel GmbH
Publication of EP1051232A1 publication Critical patent/EP1051232A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2265/00—Casings, housings or mounting for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2265/06—Details of supporting structures for filtering material, e.g. cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2271/00—Sealings for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2271/02—Gaskets, sealings
    • B01D2271/022—Axial sealings

Definitions

  • the invention relates to a filter element for voltage m a filter housing according to the preamble of the claim
  • a filter element is known from EP 0 490 169 B1, the zigzag-shaped filter paths of which are provided with edge elements which act as a sealing surface and which protrude laterally on the filter element from a predetermined area.
  • the edge elements can consist of the same material as the filter element.
  • a frame element for example formed from a urethane foam, covers the edges of the filter element on the upper clamping sides.
  • the frame element is slightly drawn into the lateral and the upper area of the filter element.
  • the invention is based on the object of designing a filter element of the type mentioned at the outset in such a way that, in the case of a simply constructed filter element, the filter element can be clamped in with simple means.
  • the filter element according to the invention is advantageous, in particular for use as an air filter in a motor vehicle, in that the frame elements easily fold a predetermined area on the upper and / or lower side of the filter element into the surface of the filter element.
  • the frame elements are glued or welded to the surface of the filter element and serve laterally as supports for clamping the entire filter element between the housing parts.
  • the filter element can therefore be easily inserted into a housing part without protruding parts clamped and trimmed over the side surface of the frame elements when assembling the housing.
  • the filter element is constructed in a particularly simple manner and, in particular, is also advantageously recyclable if the frame elements and the filter webs are made of the same material, for example of paper.
  • a good strength of the entire filter element is achieved if a cover provided with recesses is attached or glued to the bottom and / or top of the filter element in addition to the frame elements described above, which covers the entire surface and forms parts of the frame elements and the sealing surface at the edges of the surface.
  • the cover can be folded down sideways in a simple manner.
  • the frame elements can be glued or welded to one another at the respective mutually bordering points, all frame elements and possibly the cover being punched out of one piece and folded into the required shape.
  • Figure 1 shows an exemplary embodiment of a filter element with two opposite, folded frame elements
  • Figure 2 shows another embodiment of a filter element with a cover and two frame elements
  • Figure 3 shows a section through a clamping of the filter element in the filter housing.
  • the filter element 1 shows a first exemplary embodiment of a filter element 1, for example for air filtering in the intake tract of a motor vehicle.
  • the filter element 1 has zig-zag folded paper filter sheets 2 through which the air to be filtered passes according to the arrows 3.
  • the filter element 1 also has edge elements 4 and 5 made of paper, which are folded around at the ends 6 and 7 to the filter webs 2 and glued to them.
  • edge elements 8 and 9 are glued to the surface 10 of the filter element 1.
  • the folded ends 7 and the edge elements 8 and 9 also serve as a sealing surface when the filter element 1 is clamped in a filter housing.
  • the cover 11 glued from paper with recesses 12 for the passage of the air to be filtered.
  • the cover 11 is folded down at the edges to form edge elements 13, so that here too a firm bordering of the tracks 2 of the filter element 1 and at the same time a sealing surface is formed on the top of the cover 11, as described with reference to FIG. 1.
  • FIG. 3 shows an example of clamping the filter element 1 between housing parts 14 and 15 of a filter housing.
  • the filter element 1 is clamped tightly and firmly when the housing parts 14 and 15 are joined together by means of an elastic seal 16 with their sealing surfaces (for example 6.7) on the edge elements 4 and 5 or 8 and 9 (not visible here).
  • an elastic seal 16 with their sealing surfaces (for example 6.7) on the edge elements 4 and 5 or 8 and 9 (not visible here).
  • 5 frame elements
  • 7 areas folded over
  • 9 frame elements
  • Housing parts 6 seal

Abstract

The invention relates to a filter element having filter belts (2), folded in a zigzag, which are supported by a frame and can be mounted with this frame inside a housing. On at least two opposite frame elements (4, 5), predefined areas (6, 7) of the upper and/or lower side of the filter element (1) are folded back into the surface (10) of the filter element (1) and, at least here, are glued or welded to the filter element (1). The frame elements (4, 5) serve as a support for the filter element (1) during mounting between the housing parts (14, 15).

Description

Filterelement zur Einspannunq n e n Filtergehause Filter element for clamping the filter housing
Stand der TechnikState of the art
Die Erfindung betrifft ein Filterelement zur Emspannung m ein Filtergehause nach dem Oberbegriff des AnspruchsThe invention relates to a filter element for voltage m a filter housing according to the preamble of the claim
1.1.
Es ist aus der EP 0 490 169 Bl ein Filterelement bekannt, dessen zick-zack-formige Filterbahnen mit Randelementen versehen werden, die als Dichtflache wirken und seitlich am Filterelement einen vorgegebenen Bereich überstehen. Die Randelemente können dabei aus dem gleichen Material wie das Filterelement bestehen. Zur Einbringung des Filterelements m ein Filtergehause werden die überstehenden Bereiche der Randelemente zwischen die Gehauseteile ge- legt und somit wird beim festen Zusammenfugen der Gehauseteile das Filterelement eingespannt.A filter element is known from EP 0 490 169 B1, the zigzag-shaped filter paths of which are provided with edge elements which act as a sealing surface and which protrude laterally on the filter element from a predetermined area. The edge elements can consist of the same material as the filter element. To insert the filter element into a filter housing, the protruding areas of the edge elements are placed between the housing parts. sets and thus the filter element is clamped when the housing parts are firmly joined together.
Weiterhin ist aus der DE 195 09 825 AI bekannt, dass ein Rahmenelement, beispielsweise geformt aus einem Urethan- schaum, die Kanten des Filterelementes an der oberen Einspannseiten abdeckt. Hierbei ist das Rahmenelement jeweils geringfügig in den seitlichen und den oberen Bereich des Filterelementes hereingezogen.It is also known from DE 195 09 825 A1 that a frame element, for example formed from a urethane foam, covers the edges of the filter element on the upper clamping sides. Here, the frame element is slightly drawn into the lateral and the upper area of the filter element.
AufgabenstellungTask
Der Erfindung liegt die Aufgabe zugrunde, ein Filterelement der eingangs genannten Art so auszubilden, dass bei einem einfach aufgebauten Filterelement eine mit einfachen Mitteln durchzuführende Einspannung des Filterelements gewahrleistet ist.The invention is based on the object of designing a filter element of the type mentioned at the outset in such a way that, in the case of a simply constructed filter element, the filter element can be clamped in with simple means.
Vorteile der ErfindungAdvantages of the invention
Das erfindungsgemaße Filterelement ist, insbesondere für die Anwendung als Luftfilter in einem Kraftfahrzeug, dadurch vorteilhaft, dass die Rahmenelemente einen vorgegebenen Bereich an der Ober- und/oder Unterseite des Filterelements auf einfache Weise in die Flache des Filterelements hineingeklappt sind. Die Rahmenelemente sind auf der Flache des Filterelements mit diesem verklebt oder verschweißt und dienen seitlich als Stutze zur Einspannung des gesamten Filterelements zwischen den Gehauseteilen. Das Filterelement kann also einfach, ohne überstehende Teile, in ein Gehauseteil eingelegt werden und wird über die seitliche Flache der Rahmenelemente beim Zusammenbau des Gehäuses eingespannt und gestutzt.The filter element according to the invention is advantageous, in particular for use as an air filter in a motor vehicle, in that the frame elements easily fold a predetermined area on the upper and / or lower side of the filter element into the surface of the filter element. The frame elements are glued or welded to the surface of the filter element and serve laterally as supports for clamping the entire filter element between the housing parts. The filter element can therefore be easily inserted into a housing part without protruding parts clamped and trimmed over the side surface of the frame elements when assembling the housing.
Besonders einfach ist das Filterelement aufgebaut und insbesondere auch m vorteilhafter Weise recycelfahig, wenn die Rahmenelemente und die Filterbahnen aus dem gleichen Material, beispielsweise aus Papier, hergestellt sind.The filter element is constructed in a particularly simple manner and, in particular, is also advantageously recyclable if the frame elements and the filter webs are made of the same material, for example of paper.
Eine gute Festigkeit des gesamten Filterelements, insbesondere bei einer Verwendung von nicht sehr dicken oder steifen Materialien, wird erreicht, wenn auf der Unter- und/oder Oberseite des Filterelements zusätzlich zu den oben beschriebenen Rahmenelemente eine mit Ausnehmungen versehene Abdeckung angebracht bzw. geklebt wird, die die gesamte Flache bedeckt und an den Randern der Flache Teile der Rahmenelemente und der Dichtflache bildet.A good strength of the entire filter element, in particular when using materials that are not very thick or stiff, is achieved if a cover provided with recesses is attached or glued to the bottom and / or top of the filter element in addition to the frame elements described above, which covers the entire surface and forms parts of the frame elements and the sealing surface at the edges of the surface.
Auf einfache Weise kann, um eine weitere Verbesserung der Stabilität an den Randern zu erreichen, an denen eventuell keine weiteren Rahmenelemente angeordnet sind, die Abdeckung einen vorgegebenen Bereich seitlich heruntergeklappt werden.In order to achieve a further improvement in stability at the edges, on which no further frame elements may be arranged, the cover can be folded down sideways in a simple manner.
Die Rahmenelemente können m vorteilhafter Weise mit für sich bekannten Methoden an den jeweils anemandergrenzen- den Stellen miteinander verklebt oder verschweißt werden, wobei auch alle Rahmenelemente und gegebenenfalls die Abdeckung aus einem Stuck ausgestanzt und durch Faltung m die benotigte Form gebracht sind.In an advantageous manner, the frame elements can be glued or welded to one another at the respective mutually bordering points, all frame elements and possibly the cover being punched out of one piece and folded into the required shape.
Diese und weitere Merkmale von bevorzugten Weiterbildungen der Erfindung gehen außer aus den Ansprüchen auch aus der Beschreibung und den Zeichnungen hervor, wobei die einzelnen Merkmale jeweils für sich allein oder zu mehreren in Form von Unterkombinationen bei der Ausführungsform der Erfindung und auf anderen Gebieten verwirklicht sein und vorteilhafte sowie für sich schutzfahige Ausfuhrungen darstellen können, für die hier Schutz beansprucht wird.These and other features of preferred developments of the invention are evident from the claims and also from the description and the drawings, the individual features can be realized individually or in groups in the form of sub-combinations in the embodiment of the invention and in other fields and can represent advantageous and protectable designs for which protection is claimed here.
Zeichnungdrawing
Ausfuhrungsbeispiele des erfindungsgemaßen Filterelements werden anhand der Zeichnung erläutert. Es zeigen:Exemplary embodiments of the filter element according to the invention are explained with reference to the drawing. Show it:
Figur 1 ein Ausfuhrungsbeispiel eines Filterelements mit zwei gegenüberliegenden, herumgeklappten Rahmenelementen;Figure 1 shows an exemplary embodiment of a filter element with two opposite, folded frame elements;
Figur 2 ein weiteres Ausfuhrungsbeispiel eines Filterelements mit einer Abdeckung und zwei Rahmenelementen undFigure 2 shows another embodiment of a filter element with a cover and two frame elements and
Figur 3 einen Schnitt durch eine Einspannung des Filterelements im Filtergehause.Figure 3 shows a section through a clamping of the filter element in the filter housing.
Beschreibung der AusfuhrungsbeispieleDescription of the exemplary embodiments
In Figur 1 ist ein erstes Ausfuhrungsbeispiel eines Filterelementes 1, beispielsweise für die Luftfilterung im Ansaugtrakt eines Kraftfahrzeuges, gezeigt. Das Filterelement 1 weist beim Ausfuhrungsbeispiel zick-zack-for ig gefaltete Papierfilterbahnen 2 auf, durch die die zu filternde Luft gemäß der Pfeile 3 hindurchtritt. An gegenüberliegenden Seiten weist das Filterelement 1 Randelemente 4 und 5 ebenfalls aus Papier auf, die an den Enden 6 und 7 zu den Filterbahnen 2 herumgeklappt und mit diesen verklebt sind. An den andern Kanten des Filterelements 1 sind Papierstreifen als Randelemente 8 und 9 auf die Oberflache 10 des Filterelements 1 geklebt. Die herumgeklappten Enden 7 und die Randelemente 8 und 9 dienen hierbei auch als Dichtflache bei der Einspannung des Filterelements 1 in ein Filtergehause.1 shows a first exemplary embodiment of a filter element 1, for example for air filtering in the intake tract of a motor vehicle. In the exemplary embodiment, the filter element 1 has zig-zag folded paper filter sheets 2 through which the air to be filtered passes according to the arrows 3. On opposite sides, the filter element 1 also has edge elements 4 and 5 made of paper, which are folded around at the ends 6 and 7 to the filter webs 2 and glued to them. At the other edges of the filter element 1, paper strips as edge elements 8 and 9 are glued to the surface 10 of the filter element 1. The folded ends 7 and the edge elements 8 and 9 also serve as a sealing surface when the filter element 1 is clamped in a filter housing.
Beim Ausfuhrungsbeispiel nach Figur 2 ist auf der Flache2 is on the surface
10 an der Oberseite des Filterelements 1 eine Abdeckung10 on the top of the filter element 1 a cover
11 aus Papier mit Ausnehmungen 12 für den Durchtritt der zu filternden Luft angeklebt. Die Abdeckung 11 ist an den Kanten zur Bildung von Randelementen 13 heruntergeklappt, so dass auch hier eine feste Einfassung der Bahnen 2 des Filterelements 1 und gleichzeitig auf der Oberseite der Abdeckung 11 eine Dichtfläche, wie anhand der Figur 1 beschrieben, gebildet ist.11 glued from paper with recesses 12 for the passage of the air to be filtered. The cover 11 is folded down at the edges to form edge elements 13, so that here too a firm bordering of the tracks 2 of the filter element 1 and at the same time a sealing surface is formed on the top of the cover 11, as described with reference to FIG. 1.
Anhand Figur 3 ist beispielhaft eine Einspannung des Filterelements 1 zwischen Gehauseteilen 14 und 15 eines Fil- tergehauses dargestellt. Das Filterelement 1 wird beim Zusammenfugen der Gehauseteile 14 und 15 über eine elastische Dichtung 16 mit ihren Dichtflachen ( beispielsweise 6,7) an den Randelementen 4 und 5, bzw. 8 und 9 (hier nicht sichtbar) dicht und fest eingespannt. BezugszeichenlisteFIG. 3 shows an example of clamping the filter element 1 between housing parts 14 and 15 of a filter housing. The filter element 1 is clamped tightly and firmly when the housing parts 14 and 15 are joined together by means of an elastic seal 16 with their sealing surfaces (for example 6.7) on the edge elements 4 and 5 or 8 and 9 (not visible here). Reference list
= Filterelement = Filterbahnen = Strömungsrichtung der zu filternden Luft ,5 = Rahmenelemente ,7 = herumgeklappte Bereiche ,9 = Rahmenelemente 0 = Fläche des Filterelements 1 1 = Abdeckung 2 = Ausnehmungen in der Abdeckung 11 3 = heruntergeklappte Bereiche der Abdeckung 11 4,15= Gehäuseteile 6 = Dichtung = Filter element = filter paths = flow direction of the air to be filtered, 5 = frame elements, 7 = areas folded over, 9 = frame elements 0 = surface of the filter element 1 1 = cover 2 = recesses in the cover 11 3 = areas of the cover 11 folded down 4.15 = Housing parts 6 = seal

Claims

PatentansprucheClaims
1) Filterelement mit1) Filter element with
- zick-zack-formig gefalteten Filterbahnen (2), die von einem Rahmen gehalten und mit diesem Rahmen in ein Filtergehause einsetzbar sind, wobei Rahmenelemente zumindest teilweise eine Dichtflache bei der Einspannung des Filterelements (1) im Gehäuse (14,15) bilden, dadurch gekennzeichnet, dass- Zigzag-shaped folded filter sheets (2), which are held by a frame and can be used with this frame in a filter housing, frame elements at least partially forming a sealing surface when the filter element (1) is clamped in the housing (14, 15), characterized in that
- mindestens zwei gegenüberliegende Rahmenelemente (4,5) einen vorgegebenen Bereich (6,7) jeweils an der Ober- und/oder Unterseite des Filterelements in die Fläche (10) des Filterelements (1) hineingeklappt sind und zumindest dort mit dem Filterelement (1) verklebt oder verschweißt sind, dass- At least two opposite frame elements (4, 5) a predetermined area (6, 7) are each folded into the surface (10) of the filter element (1) on the top and / or bottom of the filter element and at least there with the filter element (1 ) are glued or welded that
- das Rahmenelemente (4,5) die seitlichen Flachen des Filterelements vollständig bedecken und dabei als Stutze zur Einspannung des gesamten Filterelements (1) in der Einspannrichtung zwischen den Gehäuseteilen (14,15) dienen .- The frame elements (4,5) completely cover the lateral surfaces of the filter element and thereby as a support for clamping the entire filter element (1) in the Clamping direction between the housing parts (14, 15) are used.
2) Filterelement nach Anspruch 1, , dadurch gekennzeichnet:, dass die Rahmenelemente (4,5,8,9) und die Filterbahnen (2) aus dem gleichen Material hergestellt sind.2) Filter element according to claim 1, characterized in that the frame elements (4,5,8,9) and the filter sheets (2) are made of the same material.
3) Filterelement nach Anspruch 1 oder 2, dadurch gekennzeichnet., dass3) Filter element according to claim 1 or 2, characterized. That
- auf der Unter- und/oder Oberseite des Filterelements (1) eine mit Ausnehmungen (13) versehene Abdeckung (11) die gesamte Fläche (10) bedeckt und an den Rändern der Fläche (10) teilweise die Rahmenelemente und die Dichtfläche bildet.- On the bottom and / or top of the filter element (1) a with recesses (13) provided cover (11) covers the entire surface (10) and partially forms the frame elements and the sealing surface at the edges of the surface (10).
4) Filterelement nach Anspruch 3, dadurch gekennzeichnet, dass4) Filter element according to claim 3, characterized in that
- an den Rändern, an denen keine weiteren Rahmenteile angeordnet sind die Abdeckung (10) einen vorgegebenen Bereich (13) seitlich heruntergeklappt ist.- At the edges where no further frame parts are arranged, the cover (10) has a predetermined area (13) folded down to the side.
5) Filterelement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass5) Filter element according to one of the preceding claims, characterized in that
- die Rahmenelemente ( , 5, 8 , 9; 11, 13) an den jeweils an- einandergrenzenden Stellen miteinander verklebt oder verschweißt sind. 6) Filterelement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass- The frame elements (5, 8, 9; 11, 13) are glued or welded to each other at the respectively adjacent points. 6) Filter element according to one of the preceding claims, characterized in that
- alle Rahmenelemente (4,5,8,9) und gegebenenfalls die Abdeckung (11,13) aus einem Stück ausgestanzt und durch Faltung in die benötigte Form gebracht sind.- All frame elements (4,5,8,9) and optionally the cover (11,13) are punched out of one piece and folded into the required shape.
7) Filterelement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Filterbahnen (2), die Rahmenelemente (4,5,8,9) und gegebenenfalls die Abdeckung (11,13) aus Papier sind. 7) Filter element according to one of the preceding claims, characterized in that the filter sheets (2), the frame elements (4,5,8,9) and optionally the cover (11,13) are made of paper.
EP98945109A 1997-08-19 1998-07-29 Filter element for mounting in a filter housing Withdrawn EP1051232A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19735992 1997-08-19
DE1997135992 DE19735992A1 (en) 1997-08-19 1997-08-19 Vehicle air filter element
PCT/EP1998/004736 WO1999008775A1 (en) 1997-08-19 1998-07-29 Filter element for mounting in a filter housing

Publications (1)

Publication Number Publication Date
EP1051232A1 true EP1051232A1 (en) 2000-11-15

Family

ID=7839462

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98945109A Withdrawn EP1051232A1 (en) 1997-08-19 1998-07-29 Filter element for mounting in a filter housing

Country Status (3)

Country Link
EP (1) EP1051232A1 (en)
DE (1) DE19735992A1 (en)
WO (1) WO1999008775A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE0402604D0 (en) 2004-10-27 2004-10-27 Camfil Ab Air filter unit
DE102005062209A1 (en) * 2005-12-24 2007-07-05 Mahle International Gmbh Plate-like filter insert for gas filter comprises filter material formed as folded strip material with front folds closed by sealing strip
WO2015074806A1 (en) 2013-11-20 2015-05-28 Mann+Hummel Gmbh Filter element having a filter bellows
DE102015003101A1 (en) * 2015-03-11 2016-09-15 Mann + Hummel Gmbh filter element

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3392846A (en) * 1964-10-01 1968-07-16 American Air Filter Co Unit filter assembly
FR2139878B1 (en) * 1971-06-01 1976-10-29 Donaldson Co Inc
US3853529A (en) * 1971-06-09 1974-12-10 Farr Co Pleated air filter cartridge
DE3110131A1 (en) * 1981-03-16 1982-12-30 Rainer 5820 Gevelsberg Schulz Filter for air and gas purification
ATE175889T1 (en) * 1993-05-04 1999-02-15 Mann & Hummel Filter FILTER ELEMENT
DE4323522A1 (en) * 1993-07-14 1995-01-19 Knecht Filterwerke Gmbh Filter element made of filter web material folded in a zigzag shape
GB9405670D0 (en) * 1994-03-22 1994-05-11 Ac Delco Systems Overseas Corp Air filter

Non-Patent Citations (1)

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Title
See references of WO9908775A1 *

Also Published As

Publication number Publication date
DE19735992A1 (en) 1999-02-25
WO1999008775A1 (en) 1999-02-25

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