Patent US5082594A successfully refreshed from Google Patents.
US5082594A
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Material for polarizable electrode
Assignee: Toyobo Co Ltd
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Filing: 1991-02-11
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Granted: 1992-01-21
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Expires: 2011-02-11
Abstract
Abstract A material is provided for a polarizable electrode. The material comprises a porous carbon material of activated carbon, activated carbon fibers, carbon fibers or powdery carbon as a raw material, wherein the total amount of acid groups of said porous carbon materials is 0.45 to 4.0 μeq/m 2 based on the BET surface area of said carbon material. The material is produced by subjecting the porous carbon raw material to dry oxidation treatment in an oxygen atmosphere whereby the total amount of acid groups introduced into said porous carbon material is 0.45 to 4.0 μeq/m 2 based on the BET surface area of said material.
Inventors
- 👤 Yasushi Tsuzuki
- 👤 Toshio Tanaka
- 👤 Yasuhiro Iizuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:10
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/05; C01B32/30; C01B32/354; C04; C04B; C04B41/00; C04B41/009; D; D01; D01F; D01F11/00; D01F11/10; D01F11/12; D01F11/122; G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/153; G02F1/155; H; H01; H01B; H01B1/00; H01B1/04; H01G; H01G11/00; H01G11/22; H01G11/30; H01G11/32; H01G11/34; H01G11/40; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/58; H01M4/583; H01M4/86; H01M4/96; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02E60/13; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A polarizable electrode comprising a porous carbon material of activated carbon, activated carbon fibers, carbon fibers or powdery carbon as a raw material, wherein the total amount of acid groups of said porous carbon material is 0.45 to 4.0 μeq/m 2 based on the BET surface area of said carbon material, the acid groups being at least one of a hydroxyl group and a carboxyl group.
Claim 2
Dependent Claim
66 words
A polarizable electrode comprising a porous carbon material of activated carbon, activated carbon fibers, carbon fibers or powdery carbon as a raw material, wherein the total amount of acid groups of said porous carbon material is 0.45 to 4.0 μeq/m 2 based on the BET surface area of said carbon material, the acid groups being at least one of a hydroxyl group and a carboxyl group.
References Cited (Backward Citations)
US4248945A
Cited
US4351815A
Cited
US4565744A
Cited
US4610811A
Cited
US4628015A
Cited
US4621036A
Cited
US4758473A
Cited
US4810600A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-01-20 | 1995-07-22 | 1996-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-20 | 1999-07-22 | 2000-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-20 | 2003-07-22 | 2004-01-21 | $7700.00 | Window Closed / Lapsed |