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US5213882A
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Static dissipative nonwoven textile material
Assignee: W.L. Gore and Associates Inc
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Filing: 1991-12-18
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Granted: 1993-05-25
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Expires: 2011-12-18
Abstract
Abstract A nonwoven textile material useful in dissipating static electric charges containing an electrically conductive polytetrafluoroethylene fiber. An amount of a synthetic fiber may be intermixed with the electrically conductive polytetrafluoroethylene fiber to produce the static dissipative textile material. The nonwoven static dissipative textile material may combine with a porous polymeric membrane to form nonwoven fabric laminate. The nonwoven textile material is useful as a filtration media and may be fabricated into a filter bag.
Inventors
- 👤 Robert Sassa
- 👤 Richard Winkelmayer, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:00
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/08; B01D39/083; A; A41; A41D; A41D31/00; A41D31/04; A41D31/26; A41D31/265; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; D; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4282; D04H1/4318; B01D2201/00; B01D2201/50; B01D2239/00; B01D2239/02; B01D2239/0241; B01D2239/04; B01D2239/0471; B01D2239/06; B01D2239/0604; B01D2239/064; B01D2239/065; B01D2239/12; B01D2239/1258; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1362; Y10T442/00; Y10T442/60; Y10T442/696; Y10T442/697
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
39 words
A static dissipative nonwoven textile material comprising an electrically conductive polytetrafluoroethylene fiber intermixed with at least one other synthetic organic fluorocarbon fiber, wherein the static dissipative nonwoven textile material has a static dissipation time of 0.5 seconds or less.
Claim 2
Dependent Claim
39 words
A static dissipative nonwoven textile material comprising an electrically conductive polytetrafluoroethylene fiber intermixed with at least one other synthetic organic fluorocarbon fiber, wherein the static dissipative nonwoven textile material has a static dissipation time of 0.5 seconds or less.
Claim 3
Dependent Claim
21 words
A static dissipative nonwoven textile material as described in claim 1 wherein the static dissipative textile material is in felt form.
Claim 4
Dependent Claim
39 words
A static dissipative textile material as described in claim 1 wherein the fluorocarbon is selected from the group consisting of copolymers of tetrafluoroethylene and perfluoropropyl vinyl ether, fluorinated ethylene propylene copolymer, ethylene chlorotrifluoroethylene, ethylene trifluoroethylene, polyvinyl difluoride and polytetrafluoroethylene.
Claim 5
Dependent Claim
18 words
A static dissipative textile material as described in claim 1 wherein the fluorocarbon fiber is expanded porous polytetrafluoroethylene.
Claim 6
Dependent Claim
21 words
A static dissipative textile material as described in claim 1 wherein the electrically conductive polytetrafluoroethylene fiber is conductive expanded porous polytetrafluoroethylene.
Claim 7
Dependent Claim
18 words
A static dissipative nonwoven textile material as described in claim 1 in the form of a filter bag.
Claim 8
Dependent Claim
18 words
A static dissipative nonwoven textile material as described in claim 1 in the form of a filter cloth.
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) | 1996-05-24 | 1996-11-23 | 1997-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-24 | 2000-11-23 | 2001-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-24 | 2004-11-23 | 2005-05-25 | $7700.00 | Window Closed / Lapsed |