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US3767541A
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Anodized film for electrolytic capacitor and method for preparation thereof
Assignee: General Electric Co
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Filing: 1971-06-29
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Granted: 1973-10-23
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Expires: 1991-06-29
Abstract
Abstract An anodized film is formed by oxidizing a metal selected from the group consisting of aluminum, niobium, tantalum, and titanium by forming the metal in a formation bath which consists essentially of ammonium hydroxide, sodium hydroxide, or potassium hydroxide; a polycarboxylic acid having from two to 10 carbon atoms; and an aqueous solvent. In the preferred embodiment, deionized water is used as the solvent. The formation electrolyte yields an oxide film or film-forming metals having enhanced capacitance or volt-microfarad product as compared to films formed using prior art formation electrolytes.
Inventors
- 👤 J Curtis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:02
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/0029; H01G9/0032; C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/06; C25D11/10; C25D11/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
In the manfuacture of electrodes for electrolytic capacitors, the process of forming an anodized film on aluminum which comprises electrolytically forming said film in a formation bath consisting essentially of sufficient alkali metal hydroxide to provide a pH of from about 4.7 to about 9.5, about 0.1-30 percent by weight of a dicarboxylic acid selected from the group consisting of adipic, azelaic, and sebacic acids, and the balance water at a temperature of about 80-120*C and a formation voltage of about 1-700 volts.
Claim 2
Dependent Claim
90 words
In the manufacture of electrodes for electrolytic capacitors, the process of forming anodized film on a metal member selected from the group consisting of aluminum, niobium, and tantalum which comprises electrolytically forming said film at a temperature of about 80-120*C in a formation bath consisting essentially of about 0.1-30 percent by weight of a saturated, aliphatic dicarboxylic acid selected from the group consisting of adipic, azelaic and sebacic acid, a sufficient amount of ammonium hydroxide to maintain a pH of from about 4.7 to about 9.5, and an aqueous solvent.
References Cited (Backward Citations)
US1266557A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |