Patent US4337139A successfully refreshed from Google Patents.
US4337139A
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Fluorinated carbon electrode
Assignee: Diamond Shamrock Chemicals Co
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Filing: 1980-10-31
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Granted: 1982-06-29
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Expires: 2000-10-31
Abstract
Abstract This disclosure is directed to preparing deashed, precious metal catalyst-containing, partially fluorinated active carbon particles of the formula CFx, where x ranges from 0.1 to about 0.18, preferably using either platinum or silver as the catalyzing material, which can be incorporated into an active layer component of a gas electrode, e.g., an oxygen (air) cathode suitable for use in a chlor-alkali electrolytic cell for producing chlorine and caustic while conserving electrical energy. These particles are deashed to have a B.E.T. surface area of at least 600 m2/g and contain less than about 4 weight percent ash. Active electrode layers containing such particles demonstrate an unusually desirable combination of resistance to corrosion, retention of conductive properties and retention of catalytic surface area.
Inventors
- 👤 Lawrence J. Gestaut
- 👤 Frank Solomon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:35
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/06; B01J27/08; B01J27/12; B01J31/00; B01J31/02; B01J31/06; B01J33/00; C; C01; C01B; C01B32/00; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; C25B11/095; H; H01; H01M; H01M4/00; H01M4/86; H01M4/88; H01M4/8817; H01M4/8821; H01M4/90; H01M4/92; H01M4/925; H01M4/926; H01M4/96; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/12; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
44 words
Partially fluorinated active carbon particles of the formula CF x , where x=from 0.1 to about 0.18 having an ash content of less than about 4 weight percent, a B.E.T. surface area of at least 600 m 2 /g and containing precious metal catalyst.
Claim 2
Dependent Claim
44 words
Partially fluorinated active carbon particles of the formula CF x , where x=from 0.1 to about 0.18 having an ash content of less than about 4 weight percent, a B.E.T. surface area of at least 600 m 2 /g and containing precious metal catalyst.
Claim 3
Dependent Claim
15 words
Partially fluorinated active carbon particles as in claim 1 wherein said precious metal is platinum.
Claim 4
Dependent Claim
15 words
Partially fluorinated active carbon particles as in claim 1 wherein said precious metal is silver.
Claim 5
Dependent Claim
19 words
Partially fluorinated active carbon particles as in claim 1 having a discontinuous coating of smaller adherent particles of polytetrafluoroethylene.
Claim 6
Dependent Claim
22 words
An electrode active layer containing partially fluorinated active carbon particles of the formula CF x , where x=from 0.1 to about 0.18.
Claim 7
Dependent Claim
22 words
An electrode active layer containing partially fluorinated active carbon particles of the formula CF x , where x=from 0.1 to about 0.18.
Claim 8
Dependent Claim
62 words
An electrode active layer containing partially fluorinated active carbon particles of the formula CF x , where x=from 0.1 to about 0.18 having an ash content of less than about 4 weight percent and a B.E.T. surface area of at least 600 m 2 /g, said partially fluorinated active carbon particles being mixed with carbon black, particulate polytetrafluoroethylene, and a pore former.
Claim 9
Dependent Claim
62 words
An electrode active layer containing partially fluorinated active carbon particles of the formula CF x , where x=from 0.1 to about 0.18 having an ash content of less than about 4 weight percent and a B.E.T. surface area of at least 600 m 2 /g, said partially fluorinated active carbon particles being mixed with carbon black, particulate polytetrafluoroethylene, and a pore former.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-28 | 1985-12-28 | 1986-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-28 | 1989-12-28 | 1990-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-28 | 1993-12-28 | 1994-06-29 | $7700.00 | Window Closed / Lapsed |