Patent US2496649A successfully refreshed from Google Patents.
US2496649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of oxide coatings on aluminum
Assignee: Alcoa Corp
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Filing: 1947-05-06
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Granted: 1950-02-07
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Expires: 1967-05-06
Abstract
No abstract record available.
Inventors
- 👤 Walter G Zelley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:32
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/82; C23C22/83
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
87 words
THE METHOD OF RENDERING AN OXIE COATING CHEMICALLY PRODUCED ON AN ALUMINUM ARTICLE IN AN ALKALINE SOLUTION MORE ADSORPTIVE TO DYES WHICH COMPRISES IMMERSING SAID ARTICLE IN A SOLUTION CONSISTING ESSENTIALLY OF WATER AND ABOUT 1 PER CENT BY WEIGHT OF AN AMMONIUM COMPOUND FROM THE GROUP AMMONIUM CHLORIDE, AMMONIUM NITRATE, AMMONIUM FORNATE, AMMONIUM ACETATE AND AMMONIUM SULFAMATE AS THE COATING MODIFYING COMPONENT AND MAINTAINED AT A TEMPERATURE ABOVE ABOUT 170*F. AND A PH OF ABOUT 5 TO 7.5, FOR AT LEAST ABOUT 5 TO 10 MINUTES.
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) | 1953-02-06 | 1953-08-08 | 1954-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-06 | 1957-08-08 | 1958-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-06 | 1961-08-08 | 1962-02-07 | $7700.00 | Window Closed / Lapsed |