US2593449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and composition for treating aluminum and aluminum alloys
Assignee: Kaiser Aluminum and Chemical Corp
•
Filing: 1950-10-26
•
Granted: 1952-04-22
•
Expires: 1970-10-26
Abstract
No abstract record available.
Inventors
- 👤 Hesch Frederick Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:46
CPC Classifications
C; C23; C23F; C23F3/00; C23F3/02; C23F3/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A PROCESS FOR THE CHEMICAL BRIGHTENING OF ALUMINUM AND ALUMINUM ALLOYS WHICH COMPRISES TREATING THE METAL IN AN AQUEOUS ACID BATH CONTAINING HYDROGEN, NITRATE, FLUORIDE, AMMONIUM AND PHOSPHATE IONS IN CONCENTRATION CORRESPONDING TO THAT PRODUCED BY A SOLUTION CONTAINING FROM ABOUT .5 TO 5% NITRIC ACID, ABOUT .01 TO 0.5% HYDROFLUORIC ACID, ABOUT .01 TO 0.5% AMMONIA AND ABOUT .05 TO 1% PHOSPHORIC ACID BY WEIGHT, AND MAINTAINING THE SOLUTION AT A TEMPERATURE OF ABOUT 100*F. TO THE BOILING POINT.
Claim 2
Dependent Claim
80 words
A PROCESS FOR THE CHEMICAL BRIGHTENING OF ALUMINUM AND ALUMINUM ALLOYS WHICH COMPRISES TREATING THE METAL IN AN AQUEOUS ACID BATH CONTAINING HYDROGEN, NITRATE, FLUORIDE, AMMONIUM AND PHOSPHATE IONS IN CONCENTRATION CORRESPONDING TO THAT PRODUCED BY A SOLUTION CONTAINING FROM ABOUT .5 TO 5% NITRIC ACID, ABOUT .01 TO 0.5% HYDROFLUORIC ACID, ABOUT .01 TO 0.5% AMMONIA AND ABOUT .05 TO 1% PHOSPHORIC ACID BY WEIGHT, AND MAINTAINING THE SOLUTION AT A TEMPERATURE OF ABOUT 100*F. TO THE BOILING POINT.
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) | 1955-04-22 | 1955-10-22 | 1956-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-22 | 1959-10-22 | 1960-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-22 | 1963-10-22 | 1964-04-22 | $7700.00 | Window Closed / Lapsed |