US3039899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treating aluminum surfaces
Assignee: Alcoa Corp
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Filing: 1961-02-03
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Granted: 1962-06-19
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Expires: 1981-02-03
Abstract
No abstract record available.
Inventors
- 👤 Keller Fred
- 👤 Walter G Zelley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:48
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/60; C23C22/66
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
THE METHOD OF PRODUCING AN OXIDE FILM ON AN ALUNINUM SURFACE, COMPRISING IMMERSING AN ALUMINUM SURFACE, FOR AT LEAST ABOAUT 3 MINUTES, IN A SOLUTION MAINTAINED AT A TEMPERATURE ABOVE ABOUT 175*F. AND CONSISTING ESSENTAILLY OF WATER AND AT LEAST ONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF CALCIUM OXIDE, CALCIUM HYDROXIDE CALCIUM CARBONATE, STRONTIUM CARONATE AND BARIUM CARBONATE, SAID COMPOUND RENDERING THE SOLUTION ALKALINE WITHIN A PH RANGE OF APPROXIMATELY 8.5 TO 10.5, WHEREBY A CRYSTALLINE FILM OF A-ALUMINA MONOHYDRATES IS FORMED ON THE ALUMINUM SURFACE.
Claim 2
Independent Claim
87 words
THE METHOD OF PRODUCING AN OXIDE FILM ON AN ALUNINUM SURFACE, COMPRISING IMMERSING AN ALUMINUM SURFACE, FOR AT LEAST ABOAUT 3 MINUTES, IN A SOLUTION MAINTAINED AT A TEMPERATURE ABOVE ABOUT 175*F. AND CONSISTING ESSENTAILLY OF WATER AND AT LEAST ONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF CALCIUM OXIDE, CALCIUM HYDROXIDE CALCIUM CARBONATE, STRONTIUM CARONATE AND BARIUM CARBONATE, SAID COMPOUND RENDERING THE SOLUTION ALKALINE WITHIN A PH RANGE OF APPROXIMATELY 8.5 TO 10.5, WHEREBY A CRYSTALLINE FILM OF A-ALUMINA MONOHYDRATES IS FORMED ON THE ALUMINUM SURFACE.
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) | 1965-06-18 | 1965-12-18 | 1966-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-18 | 1969-12-18 | 1970-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-18 | 1973-12-18 | 1974-06-19 | $7700.00 | Window Closed / Lapsed |