Patent US3682790A successfully refreshed from Google Patents.
US3682790A
Expired / Lapsed
US
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Process of producing anodic oxide films on aluminum
Assignee: Innova Corp
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Filing: 1969-07-29
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Granted: 1972-08-08
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Expires: 1989-07-29
Abstract
Abstract AN ANODIC COATING ON ALUMINUM AND ITS ALLOYS CAN BE OBTAINED BY IMMERSING THE ALUMINUM AS AN ANODE IN AN AQUEOUS ELECTROLYTE CONTAINING BORIC/HYDROCARBOXYLIC CHELATE ACID ANIONS TO WHICH SULFURIC ACID OR WATER SOLUBLE SULFATE OR BISULFATE SALTS ARE ADDED, AND PASSING AN ELECTRICAL CURRENT OF SUITABLE VOLTAGE AND CURRENT DENSITY THROUGH THE ELECTROLYTE SOLUTION FOR A PREDETERMINED TIME.
Inventors
- 👤 Richard D Orth
- 👤 Jack G Surendranath
- 👤 Diptiman Chakravarti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:53
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |