US2620265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition for treating aluminum and aluminum alloys
Assignee: Kaiser Aluminum and Chemical Corp
•
Filing: 1950-09-28
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Granted: 1952-12-02
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Expires: 1970-09-28
Abstract
No abstract record available.
Inventors
- 👤 Hesch Frederick Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:26
CPC Classifications
C; C23; C23F; C23F3/00; C23F3/02; C23F3/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
A COMPOSITION FOR THE CHEMICAL BRIGHTENING OF ALUMINUM AND ALUMINUM ALLOYS COMPRISING AN ACID AQUEOUS SOLUTION CONTAINING TRIVALENT CHROMINUM IONS IN AMOUNT FROM ABOUT .005 TO ABOUT 0.5%, AND HYDROGEN AND FLUORIDE IONS IN AMOUNT STOICHIOMETRICALLY EQUIVALENT TO FROM ABOUT 0.5 TO ABOUT 5% NITRIC ACID, AND ABOUT .01 TO ABOUT 0.5% HYDROFLUORIC ACID BY WEIGHT OF SOLUTION.
Claim 2
Dependent Claim
58 words
A COMPOSITION FOR THE CHEMICAL BRIGHTENING OF ALUMINUM AND ALUMINUM ALLOYS COMPRISING AN ACID AQUEOUS SOLUTION CONTAINING TRIVALENT CHROMINUM IONS IN AMOUNT FROM ABOUT .005 TO ABOUT 0.5%, AND HYDROGEN AND FLUORIDE IONS IN AMOUNT STOICHIOMETRICALLY EQUIVALENT TO FROM ABOUT 0.5 TO ABOUT 5% NITRIC ACID, AND ABOUT .01 TO ABOUT 0.5% HYDROFLUORIC ACID BY WEIGHT OF SOLUTION.
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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) | 1955-12-02 | 1956-06-02 | 1956-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-02 | 1960-06-02 | 1960-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-02 | 1964-06-02 | 1964-12-02 | $7700.00 | Window Closed / Lapsed |