US4401588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of activated carbon fabric
Assignee: EIDP Inc
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Filing: 1982-07-23
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Granted: 1983-08-30
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Expires: 2002-07-23
Abstract
Abstract Activated carbon fabric is made directly from aramid fabric in a single carbonization/activation step.
Inventors
- 👤 John J. P. Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:27
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/20; D01F9/24; D01F9/28; D01F9/30; C; C01; C01B; C01B32/00; C01B32/30; C01B32/354; C01B32/382
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
67 words
A process for making an activated carbon fabric in a single step consisting essentially of, heating an aramid fabric under a gaseous stream containing a mixture of inert gas and from about 0.5 to 20 volume percent steam at a temperature in the range of 850° to 950° C. for at least about 10 minutes and then cooling the fabric to room temperature in a protective atmosphere.
Claim 2
Dependent Claim
67 words
A process for making an activated carbon fabric in a single step consisting essentially of, heating an aramid fabric under a gaseous stream containing a mixture of inert gas and from about 0.5 to 20 volume percent steam at a temperature in the range of 850° to 950° C. for at least about 10 minutes and then cooling the fabric to room temperature in a protective atmosphere.
Claim 3
Dependent Claim
12 words
A process according to claim 1 wherein the inert gas is nitrogen.
Claim 4
Dependent Claim
20 words
A process according to claim 2 wherein at least 3 volume percent of steam is present in the gaseous stream.
Claim 5
Dependent Claim
16 words
A process according to claim 1 wherein the aramid fabric is constituted by poly(p-phenylene terephthalamide) yarn.
Claim 6
Dependent Claim
15 words
A process according to claim 1 wherein the aramid fabric is constituted by poly(benzimidazole) yarn.
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) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |