Patent US4379077A successfully refreshed from Google Patents.
US4379077A
Expired / Lapsed
US
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Active carbon conditioning process
Assignee: CYP LOGIC LLC
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Filing: 1980-10-31
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Granted: 1983-04-05
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Expires: 2000-10-31
Abstract
Abstract An improved process for making an oxygen cathode having a carbon supported hydroxide forming catalyst, wherein, prior to placement of catalyst on the carbon, active carbon particles are contacted with an alkali and then contacted with an acid. The alkali contacting step is conducted at temperatures ranging from 90 DEG -140 DEG C. for a time period of at least 0.5 hours.
Inventors
- 👤 Frank Solomon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:12
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/042; C25B11/043; C01; C01B; C01B32/00; C01B32/30; C01B32/354; C25B11/051
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
79 words
In a process for making an oxygen cathode having a carbon supported hydroxide forming catalyst the improvement comprising treating active carbon particles by contacting said active carbon particles with an alkali and thereafter contacting said active carbon particles with an acid, said contacting with alkali being conducted at temperatures ranging from about 90° to 140° C. for a time period of at least about 0.5 hours, said contacting steps occurring prior to placement of any catalyst on the carbon.
Claim 2
Dependent Claim
79 words
In a process for making an oxygen cathode having a carbon supported hydroxide forming catalyst the improvement comprising treating active carbon particles by contacting said active carbon particles with an alkali and thereafter contacting said active carbon particles with an acid, said contacting with alkali being conducted at temperatures ranging from about 90° to 140° C. for a time period of at least about 0.5 hours, said contacting steps occurring prior to placement of any catalyst on the carbon.
Claim 3
Dependent Claim
39 words
A process as in claim 1 wherein said acid contact is conducted using a constant boiling mineral acid at temperatures ranging from ambient to the boiling range of said acid for time periods of about 0.5 to 16 hours.
Claim 4
Dependent Claim
27 words
A process as in claim 1 wherein the respective separate alkali and acid contacts are conducted in a plurality of steps with water washing between each step.
Claim 5
Dependent Claim
30 words
A process as in claim 1 wherein said active carbon is comminuted to a particle size ranging from about 5 to about 30 microns before either alkali or acid contact.
Claim 6
Dependent Claim
12 words
A process as in claim 1 wherein said acid is hydrochloric acid.
Claim 7
Dependent Claim
12 words
A process as in claim 1 wherein said alkali is sodium hydroxide.
Claim 8
Dependent Claim
12 words
A process as in claim 1 wherein said alkali is potassium hydroxide.
References Cited (Backward Citations)
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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) | 1986-04-04 | 1986-10-04 | 1987-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-04 | 1990-10-04 | 1991-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-04 | 1994-10-04 | 1995-04-05 | $7700.00 | Window Closed / Lapsed |