US3239436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making titanium electrolytic capacitors
Assignee: Panasonic Holdings Corp
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Filing: 1962-09-28
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Granted: 1966-03-08
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Expires: 1982-09-28
Abstract
No abstract record available.
Inventors
- 👤 Hagiwara Hiroshi
- 👤 Yamashita Akio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:19
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/0029; H01G9/0032
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A METHOD OF MAKING TITANIUM ELECTROLYTIC CAPACITORS COMPRISING PROVIDING A BASE OF TITANIUM METAL, SUBJECTING SAID BASE TO A PRETREATMENT BY IMMERSING THE SAME INTO AN ACID TO WHICH THE TITANIUM METAL IS CORROSION RESISTANT FOR A TIME SUFFICIENT TO REMOVE ANY IMPURITIES FROM THE SURFACE OF SAID BASE AND TO FORM A THIN, UNIFORM, OXIDE FILM THEREON, AND ANODIZING THE PRETREATED BASE IN A MOLTEN ELECTROLYTE CONSISTING ESSENTIALLY OF A MIXTURE OF THE NITRATES OF AN ALKALI METAL AND AN ALKALINE EARTH METAL.
Claim 2
Independent Claim
84 words
A METHOD OF MAKING TITANIUM ELECTROLYTIC CAPACITORS COMPRISING PROVIDING A BASE OF TITANIUM METAL, SUBJECTING SAID BASE TO A PRETREATMENT BY IMMERSING THE SAME INTO AN ACID TO WHICH THE TITANIUM METAL IS CORROSION RESISTANT FOR A TIME SUFFICIENT TO REMOVE ANY IMPURITIES FROM THE SURFACE OF SAID BASE AND TO FORM A THIN, UNIFORM, OXIDE FILM THEREON, AND ANODIZING THE PRETREATED BASE IN A MOLTEN ELECTROLYTE CONSISTING ESSENTIALLY OF A MIXTURE OF THE NITRATES OF AN ALKALI METAL AND AN ALKALINE EARTH METAL.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |