Patent US3639221A successfully refreshed from Google Patents.
US3639221A
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Process for integral color anodizing
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1969-12-22
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Granted: 1972-02-01
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Expires: 1989-12-22
Abstract
Abstract A process for integral color anodizing of aluminum and aluminum alloys wherein the aluminum piece is subjected as an anode to electrolysis in an aqueous solution containing sulfuric acid, and at least one compound selected from the group consisting of molybdates, tungstates, vanadates and manganates, a portion of which exists in a polyacid species.
Inventors
- 👤 Geoffrey Austin Dorsey Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:44
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/14
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
44 words
The process according to claim 1 wherein the sulfuric acid concentration is from about 0.1 to 0.8 percent by weight and the concentration of a compound selected from the group consisting of molybdates, vanadates, tungstates and manganates is from about 0.03 to 0.5 gram-mols/liter.
Claim 2
Dependent Claim
19 words
The process according to claim 2 wherein the compound is selected from the group consisting of molybdates and tungstates.
Claim 3
Dependent Claim
26 words
The process according to claim 3 wherein a portion of a compound selected from the group consisting of molybdates and tungstates is complexed with oxalic acid.
References Cited (Backward Citations)
CA662063A
Cited
GB1022927A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |