Patent US4728426A successfully refreshed from Google Patents.
US4728426A
Expired / Lapsed
US
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Filter pack
Assignee: Karlsruher Institut für Technologie
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Filing: 1986-12-04
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Granted: 1988-03-01
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Expires: 2006-12-04
Abstract
Abstract A filter pack for gas and/or liquid filtration employing filter medium surfaces disposed between pairs of spacers, with the spacers having a corrugated configuration and the edges of the corrugations of each spacer preferably being mutually parallel to one another, the improvement wherein the edges of the corrugations of the spacers placed adjacent to the two sides of one filter medium surface are locally oriented at an angle toward one another.
Inventors
- 👤 Volker Rudinger
- 👤 Hans Leibold
- 👤 Ulrich Schlor
- 👤 Werner Alken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:47
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/523; B01D25/00; B01D25/22; B01D25/26; B01D46/10; B01D2275/00; B01D2275/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
140 words
In a filter pack for fluid filtration, comprising means defining filter medium surfaces forming a folded filter medium and a plurality of spacers, with each surface having two sides and being disposed between a respective pair of the spacers and wherein each spacer has two connecting edges and a corrugated configuration, the improvement wherein: the corrugations of each respective pair of spacers adjacent the two sides of one filter medium surface are locally oriented at an angle toward one another; respective pluralities of the corrugations of each of the spacers of each respective pair of spacers intersect the respective two connecting edges; and each spacer and the connecting edges thereof are disposed on a same side of one of the filter medium surfaces in contact therewith and the connecting edges have a straight uncorrugated termination terminating on said same side.
Claim 2
Dependent Claim
140 words
In a filter pack for fluid filtration, comprising means defining filter medium surfaces forming a folded filter medium and a plurality of spacers, with each surface having two sides and being disposed between a respective pair of the spacers and wherein each spacer has two connecting edges and a corrugated configuration, the improvement wherein: the corrugations of each respective pair of spacers adjacent the two sides of one filter medium surface are locally oriented at an angle toward one another; respective pluralities of the corrugations of each of the spacers of each respective pair of spacers intersect the respective two connecting edges; and each spacer and the connecting edges thereof are disposed on a same side of one of the filter medium surfaces in contact therewith and the connecting edges have a straight uncorrugated termination terminating on said same side.
Claim 3
Dependent Claim
30 words
The improvement as in claim 1, wherein said respective plurality of corrugations of each of the spacers of each said respective pair of spacers each comprises at least four corrugations.
Claim 4
Dependent Claim
17 words
The filter pack of claim 1, wherein the corrugations of each spacer are parallel to one another.
Claim 5
Dependent Claim
39 words
The filter pack of claim 1, wherein the corrugations on both sides of each filter medium surface are oriented toward one another to provide a plurality of contact points with each filter medium surface and to support one another.
Claim 6
Dependent Claim
22 words
The filter pack of claim 1, wherein the spacers are configured to be permeable to at least one of gas and liquids.
Claim 7
Dependent Claim
15 words
The filter pack of claim 1, wherein the angle is between about 2° and 90°.
Claim 8
Dependent Claim
12 words
The filter pack of claim 1, wherein the angle is about 30°.
Claim 9
Dependent Claim
155 words
In a filter pack for fluid filtration, comprising a housing and means in the housing defining filter medium surfaces forming a folded filter medium and a plurality of spacers, with each surface having two sides and being disposed between a respective pair of the spacers and wherein each spacer has two connecting edges and a corrugated configuration, the improvement wherein: the corrugations of each respective pair of spacers adjacent the two sides of one filter medium surface are locally oriented at an angle toward one another; a plurality of the corrugations of each of the spacers of each said respective pair of spacers intersects each of the two connecting edges; the connecting edges of each spacer have a straight uncorrugated termination; and the filter pack further comprises glue penetrating between all of the spacers and filter medium surfaces and tightly sealing the straight uncorrugated termination of the connecting edges of each spacer to said housing.
Claim 10
Dependent Claim
155 words
In a filter pack for fluid filtration, comprising a housing and means in the housing defining filter medium surfaces forming a folded filter medium and a plurality of spacers, with each surface having two sides and being disposed between a respective pair of the spacers and wherein each spacer has two connecting edges and a corrugated configuration, the improvement wherein: the corrugations of each respective pair of spacers adjacent the two sides of one filter medium surface are locally oriented at an angle toward one another; a plurality of the corrugations of each of the spacers of each said respective pair of spacers intersects each of the two connecting edges; the connecting edges of each spacer have a straight uncorrugated termination; and the filter pack further comprises glue penetrating between all of the spacers and filter medium surfaces and tightly sealing the straight uncorrugated termination of the connecting edges of each spacer to said housing.
Claim 11
Dependent Claim
44 words
The improvement as in claim 8 wherein each spacer and the connecting edges thereof are disposed on a same side of one of the filter medium surfaces in contact therewith and the straight uncorrugated terminations of the connecting edges terminate on said same side.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-01 | 1991-08-31 | 1992-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-01 | 1995-08-31 | 1996-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-01 | 1999-08-31 | 2000-03-01 | $7700.00 | Window Closed / Lapsed |