US3669855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of integral color anodizing process
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1970-01-28
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Granted: 1972-06-13
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Expires: 1990-01-28
Abstract
Abstract A process for controlling an integral color anodizing process to minimize the effect of variations in electrolyte bath composition, temperature and the like upon the color of the anodic oxide coatings comprising developing a voltage-time relationship to obtain a desired color and controlling the anodizing process in accordance with the developed voltage-time relationship.
Inventors
- 👤 Richard L Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:29
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/14
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
64 words
The process of claim 1 wherein the voltage-time relationship is transferred into a data storage means by scribing a line representing said relationship on a plate having a conductive surface, thereby dividing said conductive surface into two electrically isolated conductive surfaces, the scribed plate is scanned at a time-based speed, and a signal is generated representing the voltage-time relationship as scribed on said plate.
Claim 2
Dependent Claim
83 words
The method of claim 1 wherein the electrolyte comprises an aqueous solution of 0.1 to 2.0 percent sulfuric acid and a compound selected from the group consisting between about 5 and 30 percent by weight of an organic acid selected from the group consisting of sulfosalicylic acid, sulfophthalic acid, lignosulfonic acid, sulforesorcinol, oxalic acid, maleic acid, succinic acid and combinations thereof; and between 0.03 to 0.50 gram-mol per liter of polyacid species selected from the group consisting of dichromates, molybdates, tungstates and vanadates.
Claim 3
Dependent Claim
34 words
The method of claim 1 wherein the voltage is controlled through a constantly increasing period untiL a desired peak voltage is reached and then through a substantially constant voltage at substantially said peak voltage.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |