Patent US2666023A successfully refreshed from Google Patents.
US2666023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anodic coating of aluminum
Assignee: Individual
•
Filing: 1948-12-30
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Granted: 1954-01-12
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Expires: 1968-12-30
Abstract
No abstract record available.
Inventors
- 👤 Schaaber Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:33
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
105 words
A PROCESS FOR THE PRODUCTION OF AN OXIDIC COATING UPON AN ALUMINUM BASE METAL WHICH COMPRISES IMMERSING SAID ALUMINUM BASE METAL IN A SUBSTANTIALLY WATER-FREE FUSED BATH ESSENTIALLY CONSISTING OF AT LEAST ONE ALKALI METAL NITRATE AND AT LEAST ONE ALKALI METAL NITRITE AND SUPPLYING AN ANODIZING CURRENT TO SAID IMMERSED ALUMINUM BASE METAL WHICH ANODIZING CURRENT PERIODICALLY VARIES FROM A VOLTAGE BETWEEN -2.0 VOLTS AND 0 VOLT TO A POSITIVE ANODIZING VOLTAGE UP TO 50 VOLTS, THE FUSED SALT BATH BEING MAINTAINED AT A TEMPERATURE BETWEEN 140* C. AND THE MELTING POINT OF THE ALUMINUM BASE METAL DURING THE TREATMENT WITH THE ANODIZING CURRENT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-11 | 1957-07-13 | 1958-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-11 | 1961-07-13 | 1962-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-11 | 1965-07-13 | 1966-01-12 | $7700.00 | Window Closed / Lapsed |