US3791940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for sealing anodized aluminum
Assignee: Alcoa Corp
•
Filing: 1972-05-12
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Granted: 1974-02-12
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Expires: 1992-05-12
Abstract
Abstract IMPROVING AN ANODIC OXIDE COATING ON ALUMINUM BY SEALING WITH AN AQUEOUS HYDROLYZABLE METALLIC SALT AND THEN TREATING WITH AT LEAST ONE AQUEOUS MINERAL ACID TO REMOVE SMUDGE FORMED DURING SEALING.
Inventors
- 👤 A Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:56
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/18; C25D11/24; C25D11/246
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |