US3704209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for electrochemical coloring of aluminum and alloys
Assignee: Cegedur GP
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Filing: 1970-07-15
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Granted: 1972-11-28
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Expires: 1990-07-15
Abstract
Abstract THE COLORING OF OXIDE LAYERS OF ALUMINUM AND ALLOYS OF ALUMINUM BY IMMERSION AS AN ELECTRODE IN AN AQUEOUS ACID BATH CONTAINING A METAL SALT IN SOLUTION AND PASSING THROUGH THE BATH AN ALTERNATING CURRENT SUPERIMPOSED BY A DIRECT CURRENT HAVING AN INTENSITY LESS THAN THE EFFECTIVE INTENSITY OF THE ALTERNATING CURRENT.
Inventors
- 👤 Jos Patrie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:10
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/18; C25D11/20; C25D11/22
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) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |