Patent US3331993A successfully refreshed from Google Patents.
US3331993A
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US
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Electrolytic capacitor with highly pure titanium electrode and method for making
Assignee: Westinghouse Electric Corp
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Filing: 1964-10-21
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Granted: 1967-07-18
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Expires: 1984-10-21
Abstract
No abstract record available.
Inventors
- 👤 Jack T Brown
- 👤 Feduska William
- 👤 Jr Robert E Gainer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:59
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/0029; H01G9/0032; C; C25; C25D; C25D11/00; C25D11/02; C25D11/26; H01G9/004; H01G9/022; H01G9/04; H01G9/042
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
IN THE PROCESS OF PRODUCING AN ELECTROLYTIC CAPACITOR EMBODYING AN ELECTRODE OF TITANIUM, THE STEPS COMPRISING: (1) PREPARING AN INGOT OF PURIFIED TITANIUM BY ELECTRICALLY MELTING AT LEAST THREE TIMES TITANIUM METAL TO PRODUCE THE INGOT, THE TITANIUM METAL AFTER THE LAST MELTING HAVING LESS THAN 300 P.P.M. OF IRON, LESS THAN 130 P.P.M. OF CARBON AND LESS THAN 750 P.P.M. OF OXYGEN, AND MINUTE QUANTITIES OF OTHER ELEMENTS, (2) ROLLING THE PURIFIED TITANIUM INGOT INTO FOIL, (3) ANNEALING THE TITANIUM FOIL AT A TEMPERATURE ABOVE 750*C. TO RECRYSTALLIZE AND STRESS RELIEVE THE FOIL
Claim 2
Dependent Claim
94 words
IN THE PROCESS OF PRODUCING AN ELECTROLYTIC CAPACITOR EMBODYING AN ELECTRODE OF TITANIUM, THE STEPS COMPRISING: (1) PREPARING AN INGOT OF PURIFIED TITANIUM BY ELECTRICALLY MELTING AT LEAST THREE TIMES TITANIUM METAL TO PRODUCE THE INGOT, THE TITANIUM METAL AFTER THE LAST MELTING HAVING LESS THAN 300 P.P.M. OF IRON, LESS THAN 130 P.P.M. OF CARBON AND LESS THAN 750 P.P.M. OF OXYGEN, AND MINUTE QUANTITIES OF OTHER ELEMENTS, (2) ROLLING THE PURIFIED TITANIUM INGOT INTO FOIL, (3) ANNEALING THE TITANIUM FOIL AT A TEMPERATURE ABOVE 750*C. TO RECRYSTALLIZE AND STRESS RELIEVE THE FOIL
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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) | 1970-07-17 | 1971-01-16 | 1971-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-17 | 1975-01-16 | 1975-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-17 | 1979-01-16 | 1979-07-18 | $7700.00 | Window Closed / Lapsed |