Patent US3976435A successfully refreshed from Google Patents.
US3976435A
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Porous electrodes and electrolytic capacitors made therefrom
Assignee: Duracell Inc USA
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Filing: 1973-11-02
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Granted: 1976-08-24
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Expires: 1993-11-02
Abstract
Abstract Porous anodes suitable for use in capacitors which involves forming moistened metal powder into a mass, freezing the moistened mass thereby bonding the metal powder together and sintering the mass to convert it to a porous pellet suitable for use as an anode for a capacitor. The anodes have a sintered density below 12 g/cc and specific capacitance of at least 2,000 uFV/g.
Inventors
- 👤 Gerhart P. Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:19
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/0029; B; B22; B22F; B22F3/00; B22F3/10; B22F3/11; B22F3/22; B22F3/222; H01M; H01M4/00; H01M4/02; H01M4/04; H01M4/0402; H01M4/0404; H01M4/043; H01M4/0433; H01M4/0471; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10S; Y10S425/00; Y10S425/044
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
19 words
An electrical capacitor preform comprising a mass of tantalum powder held together in a predetermined shape by frozen water.
Claim 2
Dependent Claim
19 words
An electrical capacitor preform comprising a mass of tantalum powder held together in a predetermined shape by frozen water.
Claim 3
Dependent Claim
24 words
The anode preform of claim 1, wherein the anode preform includes about 2 to 20 parts by weight powder for each part of water.
Claim 4
Dependent Claim
19 words
The anode preform of claim 2, wherein the tantalum powder has a particle size of up to 10 microns.
Claim 5
Dependent Claim
24 words
The anode preform of claim 2, wherein the anode preform includes about 2 to 10 parts by weight powder for each part of water.
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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) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |