SE9500772A0 - Filter - Google Patents

Filter

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Publication number
SE9500772A0
SE9500772A0 SE9500772A SE9500772A SE9500772A0 SE 9500772 A0 SE9500772 A0 SE 9500772A0 SE 9500772 A SE9500772 A SE 9500772A SE 9500772 A SE9500772 A SE 9500772A SE 9500772 A0 SE9500772 A0 SE 9500772A0
Authority
SE
Sweden
Prior art keywords
filter
piece
filter piece
folds
profiled
Prior art date
Application number
SE9500772A
Other languages
Swedish (sv)
Other versions
SE9500772D0 (en
SE9500772L (en
Inventor
Kai Henrik Häppölä
Marko Tapio Kangasniemi
Original Assignee
Parker Hannifin 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
Publication of SE9500772L publication Critical patent/SE9500772L/xx
Application filed by Parker Hannifin Oy filed Critical Parker Hannifin Oy
Publication of SE9500772D0 publication Critical patent/SE9500772D0/en
Publication of SE9500772A0 publication Critical patent/SE9500772A0/en

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

(57) Sammandrag Uppfinningen hanfor sig till ett filter (1),som bestAr av ett filterstycke (14) av ett hinnartat filtermaterial i form av en stympad kon, vilket har utforts med veck for okning av filtrerings- arealen och vilketsina bada dndar (15, 16) dr lOstagbart fast mellan tva innanfOr varandra beldgna, utmed sina motsatta randermotsvarighet med filterstyckets veck profilerade staddelar (17,18). Stoddelarna bar fastats vid en axelstang (19) som farts genom filterstycketde kan omfatta i filterstyckets bAda andar en skivformig inre del (17) och en ringformig yttre del (18), vilka dr forflyttbara i fOrhAllande till varandra i filterstyckets langdriktning for fdstning av stycket pa sin plats. Figur 1 (57) Summary The invention relates to a filter (1), which consists of a filter piece (14) of a membranous filter material in the form of a truncated cone, which has been made with folds to increase the filtration area and which baths (15). , 16) dr lOstagbart fast between two internally beldgna, along their opposite stripe counterparts with the filter piece folds profiled city parts (17,18). The support members should be attached to a shaft rod (19) which passes through the filter piece. its place. Figure 1

Description

Lfl lO 15 20 Ince! n a u an c u o: oo ,o 2 termaterialstycket fästats löstagbart vid sina stödpartier. L fl lO 15 20 Ince! n a u an c u o: oo, o 2 the piece of thermocouple is detachably attached to its support portions.

Då filtermaterialstycket blir tilltäppt, behöver inte filtret kasseras i sin helhet, utan endast filtermaterialet ersätts.When the filter material piece becomes clogged, the filter does not have to be discarded in its entirety, only the filter material is replaced.

Uppfinningen gäller en filterkonstruktion av denna typ.The invention relates to a filter construction of this type.

GB-patentskrift 1 273 251 beskriver ett filter, som omfattar ett cylinderformat, axialt veckat filtermaterialstycke, som vid vardera änden fästats mellan ingripande stödpartier profilerade enligt vecken, varvid filtermaterialets kanter frigörs mellan ändarna. Det yttre stödpartier består av hopledade segment, som vrids runt filterstycket och sammanfo- gas i en ring, som fäster filterstycket på plats. Ett liknan- de filter har beskrivits i figurer 2l~2lC av GB-patentansökan 2 162 768, i vilka den yttre stödringen för änden av ett cylinderformat filterstycke består av delar, som fästes på plats med skilda fästorgan.GB Patent Specification 1,273,251 discloses a filter comprising a cylindrical, axially folded piece of filter material, which is attached at each end between engaging support portions profiled according to the folds, the edges of the filter material being released between the ends. The outer support portions consist of hinged segments, which are rotated around the filter piece and joined together in a ring, which secures the filter piece in place. A similar filter has been described in Figures 21-221 of GB patent application 2 162 768, in which the outer support ring for the end of a cylindrical filter piece consists of parts which are fastened in place with different fastening means.

Avsikten med denna uppfinning är att åstadkomma ett filter som omfattar ett veckat, holkaktigt filtermaterialstycke, som jämfört med filtren i ovan nämnda GB-skrifter l 273 251 och 2 162 768 har en enklare konstruktion. Uppfinningen känneteck- nas av att filterstycket till sin elementära form är en styckad kon, i vilken gjorts veck för att öka filtreringsy- tan, att det fästats löstagbart mellan två ingripande stöd~ partier, profilerade vid sina motstående kanter så att de motsvarar filterstyckets veck, och att stödpartierna fästats vid en gemensam axelstång som förts genom filterstycket.The object of this invention is to provide a filter comprising a pleated, hollow-like piece of filter material, which, compared with the filters in the above-mentioned GB publications I 273 251 and 2 162 768, has a simpler construction. The invention is characterized in that the filter piece in its elementary shape is a cut cone, in which folds are made to increase the filtration surface, that it is detachably attached between two engaging support portions, profiled at their opposite edges so that they correspond to the folds of the filter piece, and that the support portions are attached to a common shaft bar which is passed through the filter piece.

Uppfinningen har den väsentliga fördelen att filterstyckets koniska form tillåter att stycket monteras på plats genom att enkelt pressa stödpartierna mot varandra så att filter- styckets ände hamnar mellan dem. Såväl det inre som det yttre stödpartiet kan bestå av ett enhetligt stycke med bestående form. Stödpartierna förskjuts då inbördes parallellt med filterstcykets axelstång, och deras motstående kanter är företrädesvis snedställda mot axelstången motsvarande konens avsmalnande form. 10 15 20 25 Stödpartierna enligt uppfinningen kan vara belägna i vardera änden av filterstycket och bestå av skivaktiga delar vars yttre kanter profilerats enligt filterstyckets veck, samt ett omgivande ringformat parti vars inre kant profilerats på motsvarande sätt.The invention has the essential advantage that the conical shape of the filter piece allows the piece to be mounted in place by simply pressing the support portions against each other so that the end of the filter piece ends up between them. Both the inner and the outer support portion can consist of a uniform piece with a permanent shape. The support portions are then displaced relative to each other with the shaft bar of the filter bicycle, and their opposite edges are preferably inclined towards the shaft bar corresponding to the tapered shape of the cone. The support portions according to the invention may be located at each end of the filter piece and consist of disc-like parts whose outer edges are profiled according to the folds of the filter piece, and a surrounding annular portion whose inner edge is profiled correspondingly.

Filtermaterialstycket med formen av en stympad kon som an- vänds i filtret enligt uppfinningen kan vara av ett material som veckats genom vikning, såsom papper, non-woven polymerfi- brer eller dylikt. Dylika filterstycken kan framställas på förhand som utbytbara delar för filtren.The filter material piece in the form of a truncated cone used in the filter according to the invention may be of a material folded by folding, such as paper, non-woven polymer fibers or the like. Such filter pieces can be manufactured in advance as replaceable parts for the filters.

Uppfinningen beskrivs närmare nedan med ett exempel och hänvisande till bifogade ritningar, i vilka figur l visar ett filter enligt uppfinningen, i vilket det färdigt veckade filterstycket med formen av en stym- pad kon vid vardera änden fästats mellan två ingri- pande stödpartier, figur 2 visar filterstycket som hör till filtret enligt figur 1, och figur 3 visar änden av filtret enligt figur l som en skärning III-III av figur l.The invention is described in more detail below with an example and with reference to the accompanying drawings, in which Figure 1 shows a filter according to the invention, in which the finished pleated filter piece in the form of a truncated cone at each end is fastened between two engaging support portions, Figure 2 shows the filter piece belonging to the filter according to Figure 1, and Figure 3 shows the end of the filter according to Figure 1 as a section III-III of Figure 1.

Ritningarna illustrerar ett filter 1 enligt uppfinningen, i vilket det veckade filterstycket 14 av papper har formen av en stympad kon. Filterstycket 14, som veckats och falsats på förhand, visas i figur 2. Stödpartierna består enligt figu- rerna l och 3 av skivaktiga partier 17, 17' i vardera änden 15, 16 av filterstycket 14, profilerade vid sin yttre kant enligt filterstyckets veckning, samt av ett omgivande parti 18, 18' som profilerats på motsvarande sätt vid sin inre kant. Mellan ändarna 15, 16 av filterstycket 14 frigörs filterytorna för passerande luftströmning. Det inre stödpar~ tiet 17 i övre änden 15 av filterstycket och det yttre stöd- partiet 18' av den nedre änden 16 är sammankopplade med en axelstång 19 som går genom filterstycket. Filterstycket 14 u. man: nano nu . 10 15 20 25 1 n b o n bl u o c 0 utan n n o l øøul ; z z -__- ø u an fun s o n 0 II to 4 monteras på plats medan det yttre stödpartiet 18 av styckets av den nedre änden 18; l7', l8', vilkas motstående kanter är snedställda mot axelstången 19 16 av 21 i ändarna av axeln, genom att kanternas sneda ytor förskjuts övre ände 15 och det inre stödpartiet 17' är lösgjorda. Därefter spänna stödpartierna 17, motsvarande konens avsmalnande form, mot ändarna 15, filterstycket och varandra med hjälp av spännmuttrar 20, axialt.The drawings illustrate a filter 1 according to the invention, in which the pleated filter piece 14 of paper has the shape of a truncated cone. The filter piece 14, which is folded and folded in advance, is shown in Figure 2. According to Figures 1 and 3, the support portions consist of disc-like portions 17, 17 'at each end 15, 16 of the filter piece 14, profiled at their outer edge according to the folding of the filter piece. and by a surrounding portion 18, 18 'which is correspondingly profiled at its inner edge. Between the ends 15, 16 of the filter piece 14, the filter surfaces are released for passing air flow. The inner support portion 17 at the upper end 15 of the filter piece and the outer support portion 18 'of the lower end 16 are connected to a shaft rod 19 passing through the filter piece. Filter piece 14 u. Man: nano now. 10 15 20 25 1 n b o n bl u o c 0 utan n n o l øøul; z z -__- ø u an fun s o n 0 II to 4 is mounted in place while the outer support portion 18 of the piece of the lower end 18; 17 ', 18', the opposite edges of which are inclined towards the shaft bar 19 16 of 21 at the ends of the shaft, in that the inclined surfaces of the edges are displaced upper end 15 and the inner support portion 17 'are loosened. Then clamp the support portions 17, corresponding to the tapered shape of the cone, towards the ends 15, the filter piece and each other by means of clamping nuts 20, axially.

I figur 1 sker filtreringen av luftströmningen enligt pilarna utifrån och in i det koniska filterstycket 14, och därifrån passerar den filtrerade luften vid nedre änden 16 av filter- stycket till ett utlopp 22 i det skivaktiga inre stödpartiet 17. En luftströmning å motsatt riktning vore givetvis även möjlig.In Figure 1, the filtration of the air flow according to the arrows takes place from the outside into the conical filter piece 14, and from there the filtered air passes at the lower end 16 of the filter piece to an outlet 22 in the disc-like inner support portion 17. An air flow in the opposite direction would of course also possible.

Det är klart för en fackman att de olika utföringsformerna av uppfinningen inte begränsas till ovan anförda exempel, utan kan variera inom ramen för bifogade patentkrav. Exempelvis kan filtermaterialet förutom tyg eller papper vara av glasfi~ bernät eller viskosfibermassa eller andra dylika non-woven fiber, som kan ligga mellan två pappersskikt. Det senare materialet lämpar sig exempelvis för renluftsfilter i bilar, som avlägsnar damm från luft som kommer in i bilen. Filtret enligt uppfinningen lämpar sig även för filtrering av väts- kor, t.ex. i form av oljefilter, förutom filtrering av gaser.It will be apparent to one skilled in the art that the various embodiments of the invention are not limited to the examples set forth above, but may vary within the scope of the appended claims. For example, in addition to fabric or paper, the filter material may be of glass fiber mesh or viscose pulp or other such non-woven fibers, which may lie between two layers of paper. The latter material is suitable, for example, for clean air filters in cars, which remove dust from air that enters the car. The filter according to the invention is also suitable for filtering liquids, e.g. in the form of oil filters, in addition to filtering gases.

Claims (23)

Patentkrav 1. Filter (1) omfattande ett holkaktigt stycke (14) av membranaktigt filtermaterial, kannetecknat av att filterstycket (14) till sin elementara form är en stympad kon, i vilken gjorts veck for att Oka filtreringsytan, att filterstycket vid vardera anden (15, 16) fastats lostagbart mellan tva ingripande stedpartier (17, 18), vars motstgende kanter profilerats motsvarande filterstyckets veck, och att stodpartierna (17, 18) fastats vid en gemensam axelstang (19) som forts genom filterstycket (14). 2. Filter enligt patentkrav 1, kannetecknat av att anden (15, 16) av filterstycket (14) spants mellan stodpartier (17, 18) som fOrskjuts inbOrdes i styckets axiala riktning. 3. Filter enligt patentkrav 2, kannetecknat av att stodpartiernas (17, 18) motstgende kanter är snedstallda mot filterstyckets (14) axel motsvarande konens avsmalnande form. 4. Filter enligt patentkrav 2 eller 3, kannetecknat av att stodpartierna (17, 18) i vardera anden (15, 16) av filterstycket (14) bestgr av ett skivaktigt parti (17) profilerat vid sin yttre kant enligt filterstyckets veckning, samt ett omgivande ringformat parti (18) motsvarande profilerat vid sin inre kant.A filter (1) comprising a hollow-like piece (14) of membrane-like filter material, characterized in that the filter piece (14) in its elemental shape is a truncated cone, in which folds are made to increase the filtration surface, that the filter piece at each end (15 , 16) is releasably fastened between two engaging seat portions (17, 18), the opposite edges of which are profiled corresponding to the folds of the filter piece, and that the stand portions (17, 18) are fastened to a common shaft rod (19) which continues through the filter piece (14). Filter according to claim 1, characterized in that the spirit (15, 16) of the filter piece (14) is clamped between support portions (17, 18) which are displaced in the axial direction of the piece. Filter according to claim 2, characterized in that the opposite edges of the support portions (17, 18) are inclined towards the axis of the filter piece (14) corresponding to the tapered shape of the cone. A filter according to claim 2 or 3, characterized in that the support portions (17, 18) in each spirit (15, 16) of the filter piece (14) consist of a disc-like portion (17) profiled at its outer edge according to the folding of the filter piece, and a surrounding annular portion (18) correspondingly profiled at its inner edge. 1. •1. • 2. • • t2. • • t 3. If •3. If • 4. • • •• •4. • • •• • 5. •5. • 6. • 0 ••6. • 0 •• 7. • *7. • * 8. • •8. • • 9. •9. • 10. • • •••10. • • ••• 11. 611. 6 12. • • • .•94.12. • • •. • 94. 13. • ••• • • • •13. • ••• • • • • 14. •14. • 15. • •15. • • 16. •416. • 4 17. • ••17. • •• 18. 0 0 •• ••18. 0 0 •• •• 19. •19. • 20. •• •••20. •• ••• 21. •21. • 22. • 0•• •••22. • 0 •• ••• 23. 0 • • 9•• (57) Sammandrag Uppfinningen hanfor sig till ett filter (1),som bestAr av ett filterstycke (14) av ett hinnartat filtermaterial i form av en stympad kon, vilket har utforts med veck for okning av filtrerings- arealen och vilketsina bada dndar (15, 16) dr lOstagbart fast mellan tva innanfOr varandra beldgna, utmed sina motsatta randermotsvarighet med filterstyckets veck profilerade staddelar (17,18). Stoddelarna bar fastats vid en axelstang (19) som farts genom filterstycketde kan omfatta i filterstyckets bAda andar en skivformig inre del (17) och en ringformig yttre del (18), vilka dr forflyttbara i fOrhAllande till varandra i filterstyckets langdriktning for fdstning av stycket pa sin plats.23. 0 • • 9 •• (57) Summary The invention relates to a filter (1), which consists of a filter piece (14) of a membranous filter material in the form of a truncated cone, which has been made with folds for increasing filtration. - the area and which baths (15, 16) are removably fixed between two mutually bounded parts, along their opposite stripe counterparts with the folded city parts of the filter piece (17,18). The support members should be attached to a shaft rod (19) which passes through the filter piece and may comprise in the two ends of the filter piece a disc-shaped inner part (17) and an annular outer part (18), which are movable in relation to each other in the longitudinal direction of the filter piece. its place.
SE9500772A 1992-05-08 1995-03-03 Filter SE9500772A0 (en)

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
SE9500772L SE9500772L (en) 1900-01-01
SE9500772D0 SE9500772D0 (en) 1995-03-03
SE9500772A0 true SE9500772A0 (en) 1995-03-03

Family

ID=8535260

Family Applications (2)

Application Number Title Priority Date Filing Date
SE9301301A SE9301301L (en) 1992-05-08 1993-04-21 Filters and procedure for constructing it
SE9500772A SE9500772A0 (en) 1992-05-08 1995-03-03 Filter

Family Applications Before (1)

Application Number Title Priority Date Filing Date
SE9301301A SE9301301L (en) 1992-05-08 1993-04-21 Filters and procedure for constructing it

Country Status (4)

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

Families Citing this family (10)

* 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
DE19632618C2 (en) * 1996-08-13 1998-06-18 Freudenberg Carl Fa Filter insert
DE29619224U1 (en) * 1996-11-06 1998-03-05 Melitta Haushaltsprodukte Filter device for the production of aroma extracts from coffee or tea
GB2327624A (en) * 1997-07-26 1999-02-03 Lucas Ind Plc Pleated filter elements
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
DE102014002159A1 (en) * 2014-02-19 2015-08-20 Mann + Hummel Gmbh Filter element for a filter device
DE102017008421A1 (en) * 2017-09-08 2019-03-14 Mann+Hummel Gmbh Brake dust particle filter and disc brake assembly with a brake dust particulate filter
CZ309991B6 (en) * 2023-08-08 2024-04-17 ATREA Group a.s. A tight air handling filter

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR499914A (en) * 1918-04-05 1920-02-26 Theodore Willard Case Resistance elements reacting to light
GB1197172A (en) * 1966-06-07 1970-07-01 Davis Ind Equipment Company Lt Improvements in and relating to Filters
US3486626A (en) * 1968-02-01 1969-12-30 Sam Close Replaceable medium,extended area filter unit
JPS54158766A (en) * 1978-06-06 1979-12-14 Schumacher Nihon Kk Filter

Also Published As

Publication number Publication date
DE4313913A1 (en) 1993-11-11
FI922108A (en) 1993-11-09
SE9500772D0 (en) 1995-03-03
GB2266673B (en) 1995-09-20
FI91219C (en) 1994-06-10
FI91219B (en) 1994-02-28
FI922108A0 (en) 1992-05-08
GB9308476D0 (en) 1993-06-09
GB2266673A (en) 1993-11-10
SE9500772L (en) 1900-01-01
SE9301301L (en) 1993-11-09
SE9301301D0 (en) 1993-04-21

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