Patent US3910701A successfully refreshed from Google Patents.
US2613141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical brightening of aluminum
Assignee: Alcoa Corp
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Filing: 1949-07-29
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Granted: 1952-10-07
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Expires: 1969-07-29
Abstract
No abstract record available.
Inventors
- 👤 William C Cochran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:07
CPC Classifications
C; C23; C23F; C23F3/00; C23F3/02; C23F3/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A METHOD FOR CHEMICAL BRIGHTENING OF ALUMINUM WHICH COMPRISES IMMERSING AN ALUMINUM ARTICLES IN A SOLUTION CONSISTING ESSENTIALLY OF ABOUT 60 TO 80 PER CENT PHOSPHERIC ACID, ABOUT 1 TO 10 PER CENT HYDROGEN PEROXIDE AND ABOUT 15 TO 35 PER CENT WATER, REFERRED TO THE TOTAL WEIGHT OF THE AFORESAID COMPONENTS, THE SOLUTION BEING MAINTAINED AT A TEMPERATURE ABOVE ABOUT 70* C.
Claim 2
Independent Claim
63 words
A METHOD FOR CHEMICAL BRIGHTENING OF ALUMINUM WHICH COMPRISES IMMERSING AN ALUMINUM ARTICLES IN A SOLUTION CONSISTING ESSENTIALLY OF ABOUT 60 TO 80 PER CENT PHOSPHERIC ACID, ABOUT 1 TO 10 PER CENT HYDROGEN PEROXIDE AND ABOUT 15 TO 35 PER CENT WATER, REFERRED TO THE TOTAL WEIGHT OF THE AFORESAID COMPONENTS, THE SOLUTION BEING MAINTAINED AT A TEMPERATURE ABOVE ABOUT 70* C.
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) | 1955-10-07 | 1956-04-07 | 1956-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-07 | 1960-04-07 | 1960-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-07 | 1964-04-07 | 1964-10-07 | $7700.00 | Window Closed / Lapsed |