Patent US2705500A successfully refreshed from Google Patents.
US2705500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning aluminum
Assignee: Individual
•
Filing: 1953-11-04
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Granted: 1955-04-05
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Expires: 1973-11-04
Abstract
No abstract record available.
Inventors
- 👤 Leon L Deer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:23
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/12; C23G1/125; C23C; C23C22/00; C23C22/78
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
THE PROCESS OF REMOVING SURFACE OXIDES FROM ALUMINUM HAVING ALLOYING CONSTITUENTS, SAID PROCESS COMPRISING COMBINING THE OXIDE WITH A FLUORINE-CONTAINING SOLUTION TO PRODUCE A FILM OF FLUORIDE SALTS OF THE BASE METAL ON ALUMINUM, RINSING IN WATER, AND THEN IMMERSING IN AN AQUEOUS BATH CONTAINING A CHROMIC ACID AND AN ALKALI SULPHATE.
Claim 2
Dependent Claim
52 words
THE PROCESS OF REMOVING SURFACE OXIDES FROM ALUMINUM HAVING ALLOYING CONSTITUENTS, SAID PROCESS COMPRISING COMBINING THE OXIDE WITH A FLUORINE-CONTAINING SOLUTION TO PRODUCE A FILM OF FLUORIDE SALTS OF THE BASE METAL ON ALUMINUM, RINSING IN WATER, AND THEN IMMERSING IN AN AQUEOUS BATH CONTAINING A CHROMIC ACID AND AN ALKALI SULPHATE.
References Cited (Backward Citations)
US795216A
Cited
US1952417A
Cited
US2137988A
Cited
US2365153A
Cited
US2650156A
Cited
US2647865A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-04-04 | 1958-10-04 | 1959-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-04 | 1962-10-04 | 1963-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-04 | 1966-10-04 | 1967-04-05 | $7700.00 | Window Closed / Lapsed |