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Patent US3486991A successfully refreshed from Google Patents.
US3486991A
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US
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Method of producing a colored anodic oxide film on aluminum
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1966-12-21
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Granted: 1969-12-30
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Expires: 1986-12-21
Abstract
No abstract record available.
Inventors
- 👤 Ikuo Hatano
- 👤 Koichiro Koyama
- 👤 Tomohiro Nishimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:22
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)
CH176639A
Cited
US2233785A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-29 | 1973-06-30 | 1973-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-29 | 1977-06-30 | 1977-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-29 | 1981-06-30 | 1981-12-30 | $7700.00 | Window Closed / Lapsed |