US2593447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and composition for treating aluminum and aluminum alloys
Assignee: Permanente Metals Corp
•
Filing: 1949-06-27
•
Granted: 1952-04-22
•
Expires: 1969-06-27
Abstract
No abstract record available.
Inventors
- 👤 Hesch Frederick Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:43
CPC Classifications
C; C23; C23F; C23F3/00; C23F3/02; C23F3/03
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
41 words
AN AQUEOUS SOLUTION FOR CHEMICALLY BRIGHTENING ALUMINUM AND ALUMINUM ALLOYS CONSISTING ESSENTIALLY OF ABOUT .5 TO 5% NITRIC ACID, ABOUT .01 TO 0.5% HYDROFLUORIC ACID, ABOUT .01 TO 0.5% AMMONIA, ABOUT .01 TO 1% CHROMIC ACID (CALCULATED AS CR03), BY WEIGHT.
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 |