US5207812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter cartridge
Assignee: W.L. Gore and Associates Inc
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Filing: 1992-05-08
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Granted: 1993-05-04
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Expires: 2012-05-08
Abstract
Abstract A pleated filter cartridge for removing particles or dust from a gas stream is described. The cartridge is made of a perforated support tube, a pleated filter medium around said tube, and end caps into which the ends of the filter medium, and the tube are sealed, wherein the pleated filter medium has less than seven pleats per inch.
Inventors
- 👤 Gregory S. Tronto
- 👤 Raymond Wnenchak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:13
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; B01D39/1692; B01D46/24; B01D46/2403; B01D46/2411; B01D46/2414; B01D46/66; B01D46/70; B01D46/71
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
81 words
A pleated filter cartridge consisting essentially of: a. a perforated support tube, b. a pleated filter medium around said tube, comprising a laminate of a nonwoven or felt backing and an expanded porous polytetrafluoroethylene, c. end caps into which the ends of the filter medium, and the tube is sealed, wherein the pleated filter medium has less than seven pleats per inch and is not supported by any external support other than the structure recited in elements a), b) and c).
Claim 2
Dependent Claim
81 words
A pleated filter cartridge consisting essentially of: a. a perforated support tube, b. a pleated filter medium around said tube, comprising a laminate of a nonwoven or felt backing and an expanded porous polytetrafluoroethylene, c. end caps into which the ends of the filter medium, and the tube is sealed, wherein the pleated filter medium has less than seven pleats per inch and is not supported by any external support other than the structure recited in elements a), b) and c).
Claim 3
Dependent Claim
25 words
The cartridge of claim 1 wherein the cartridge can withstand a grain loading of at least 2 grains per cubic foot (4.5 mg per liter).
Claim 4
Dependent Claim
16 words
The filter cartridge of claim 1 wherein the laminate is a laminate of a nonwoven backing.
Claim 5
Dependent Claim
12 words
The filter cartridge of claim 3 wherein the nonwoven backing is polyester.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-03 | 1996-11-02 | 1997-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-03 | 2000-11-02 | 2001-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-03 | 2004-11-02 | 2005-05-04 | $7700.00 | Window Closed / Lapsed |