US3804732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anodizing process
Assignee: Individual
•
Filing: 1971-07-19
•
Granted: 1974-04-16
•
Expires: 1991-07-19
Abstract
Abstract NOVEL PROCESS FOR THE BULK ANODIZING OF SMALL METAL ARTICLES, WHEREIN THE ARTICLES, GROUPED IN SPACED CONTAINERS SUSPENDED FROM AN ANODE BAR OR FROM A PLURALITY OF ANODE BARS, ARE CONTINUALLY RECIPROCATED THROUGH THE ELECTROLYTE BATH DURING TREATMENT. THE BATH, PREFERABLY A 15% TO 20% BY WEIGHT AQUEOUS SOLUTION OF SULFURIC ACID, IS MAINTAINED AT BELOW ORDINARY ROOM TEMPERATURES, PREFERABLY AT 55* TO 60*F. ANODIZED COATINGS OF INCREASED UNIFORMITY ARE THUS OBTAINED, AND THE USEFUL LIFE OF THE SOLUTION IS EXTENDED ABOUT TENFOLD, AS COMPARED WITH PROCEDURES OF THE PRIOR ART.
Inventors
- 👤 A Goodkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:39
CPC Classifications
C; C25; C25D; C25D17/00; C25D17/16; C25D17/18; C25D11/00; C25D11/02; C25D11/04; C25D11/06; C25D11/08
Claims Analysis
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References Cited (Backward Citations)
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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) | 1977-04-15 | 1977-10-15 | 1978-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-15 | 1981-10-15 | 1982-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-15 | 1985-10-15 | 1986-04-16 | $7700.00 | Window Closed / Lapsed |