US4904343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-woven activated carbon fabric
Assignee: Wyeth Holdings LLC
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Filing: 1985-11-13
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Granted: 1990-02-27
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Expires: 2005-11-13
Abstract
Abstract An air and water vapor permeable, toxic vapor absorptive non-woven fabric material comprising a web-laid sheet containing fibrillated acrylic fiber, and an activated carbon constituent selected from the group consisting of activated carbon fiber, activated carbon particles, and mixtures of activated carbon fiber and activated carbon particles.
Inventors
- 👤 Robert D. Giglia
- 👤 Edward A. Battistelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:54
CPC Classifications
D; D21; D21H; D21H13/00; D21H13/36; D21H13/46; D21H13/50; A; A62; A62D; A62D5/00; D21H5/00; D21H5/12; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24628; Y10T428/24669; Y10T428/249921; Y10T428/249953; Y10T428/249954; Y10T428/249955; Y10T428/249956; Y10T428/249958; Y10T428/249981; Y10T428/249982; Y10T428/249984; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T442/00; Y10T442/60; Y10T442/608; Y10T442/614; Y10T442/619; Y10T442/697
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
68 words
An air and water vapor permeable, toxic vapor absorptive, non-woven fabric material consisting essentially of a wet-laid sheet containing fibrillated acrylic fiber and activated carbon fiber wherein the concentration of fibrillated acrylic fiber ranges from about 5-60%, by weight, based on the total weight of fibrillated acrylic fiber and activated carbon fiber and the concentration of said activated carbon fiber ranges from about 40%-95%, by weight, same basis.
Claim 2
Dependent Claim
68 words
An air and water vapor permeable, toxic vapor absorptive, non-woven fabric material consisting essentially of a wet-laid sheet containing fibrillated acrylic fiber and activated carbon fiber wherein the concentration of fibrillated acrylic fiber ranges from about 5-60%, by weight, based on the total weight of fibrillated acrylic fiber and activated carbon fiber and the concentration of said activated carbon fiber ranges from about 40%-95%, by weight, same basis.
Claim 3
Dependent Claim
28 words
The fabric material of claim 1, wherein the surface area of the activated carbon fiber, as measured by BET determination, is greater than about 500 M 2 /gm.
Claim 4
Dependent Claim
28 words
The fabric material of claim 1, wherein the surface area of the activated carbon fiber, as measured by BET determination, is greater than about 1,000 M 2 /gm.
Claim 5
Dependent Claim
55 words
The fabric material of claim 1, wherein the distribution of fibers having a diameter below about 1 micron does not exceed about 15% by weight of the total activated carbon fiber content, and the distribution of activated carbon fibers having a diameter above about 100 microns does not exceed about 15% by weight, same basis.
References Cited (Backward Citations)
FR1409701A
Cited
GB1162110A
Cited
US3826712A
Cited
US4289513A
Cited
US4565727A
Cited
US4565727B1
Cited
US4495030A
Cited
US4495030B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-26 | 1993-08-28 | 1994-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-26 | 1997-08-28 | 1998-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-26 | 2001-08-28 | 2002-02-27 | $7700.00 | Window Closed / Lapsed |