US5350515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internally potted end cap for a pleated filter medium
Assignee: W.L. Gore and Associates Inc
•
Filing: 1993-03-29
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Granted: 1994-09-27
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Expires: 2013-03-29
Abstract
Abstract The invention comprises a filter cartridge including a cylindrical filter medium potted into a top cap, and having an internally potted bottom closure molded in place inside the filter medium.
Inventors
- 👤 Stephen Stark
- 👤 Raymond Wnenchak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:11
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21; Y; Y10; Y10S; Y10S264/00; Y10S264/48; Y10S55/00; Y10S55/05; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1036; Y10T156/1038
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
94 words
A filter cartridge comprising: (a) a cylindrically shaped, pleated filter medium closed at both ends by a potting medium; (b) one end of said filter medium being potted into the medium, (c) the other end being substantially entirely closed by potting medium located entirely inside the filter medium so that no potting medium forms on the outside of the filter medium nor protrudes on the outer surface of the medium, said potting medium situated such that the area between each pleat is entirely closed with potting medium and is continuous from pleat to pleat.
Claim 2
Dependent Claim
94 words
A filter cartridge comprising: (a) a cylindrically shaped, pleated filter medium closed at both ends by a potting medium; (b) one end of said filter medium being potted into the medium, (c) the other end being substantially entirely closed by potting medium located entirely inside the filter medium so that no potting medium forms on the outside of the filter medium nor protrudes on the outer surface of the medium, said potting medium situated such that the area between each pleat is entirely closed with potting medium and is continuous from pleat to pleat.
Claim 3
Dependent Claim
16 words
A filter cartridge of claim 1 wherein said polymer potting material comprises a curable epoxy material.
Claim 4
Dependent Claim
13 words
A filter cartridge of claim 2 wherein said epoxy material is amine curable.
Claim 5
Dependent Claim
31 words
A filter cartridge of claim 3 wherein said epoxy material is liquid and when poured into said filter medium for curing, has a viscosity of about 5,000 to about 100,000 centipoise.
Claim 6
Dependent Claim
13 words
A filter cartridge of claim 2 wherein said epoxy material is heat curable.
Claim 7
Dependent Claim
36 words
A cartridge of claim 1 wherein said filter medium comprises a non-woven textile fiber sheet bonded to a microporous polymer membrane, which membrane forms the outer surface of the medium facing the material to be filtered.
Claim 8
Dependent Claim
13 words
A cartridge of claim 6 wherein said microporous polymer membrane comprises expanded polytetrafluoroethylene.
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) | 1997-09-26 | 1998-03-28 | 1998-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-26 | 2002-03-28 | 2002-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-26 | 2006-03-28 | 2006-09-27 | $7700.00 | Window Closed / Lapsed |