US2650156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface finishing of aluminum and its alloys
Assignee: Alcoa Corp
•
Filing: 1947-09-10
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Granted: 1953-08-25
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Expires: 1967-09-10
Abstract
No abstract record available.
Inventors
- 👤 Shelton-Jones Eric
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:33
CPC Classifications
C; C23; C23F; C23F3/00; C23F3/02; C23F3/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A PROCESS FOR BRIGHTENING METAL FROM THE GROUP CONSISTING OF ALUMINUM AND ALLOYS THEREOF WHICH COMPRISES IMMERSING THE METAL IN A BATH HAVING AS THE ESSENTIAL COMPONENTS THEREOF PHOSPHORIC ACID OF THE FORMULA H3PO4 AND WATER, THE WATER BEING PRESENT IN A PROPORTION OF THE PHOSPHORIC ACID AT LEAST EQUAL TO THAT EXISTING IN PHOSPHORIC ACID OF ABOUT S. G. 1.72 (WHICH CONTAINS ABOUT 87.5% BY WEIGHT OF PHOSPHORIC ACID OF THE FORMULA H3PO4 AND ABOUT 12.5% BY WEIGHT OF WATER) AND IN A TOTAL AMOUNT UP TO THAT EXISTING IN A SOLUTION OF PHOSPORIC ACID OF ABOUT S. G. 1.72 AND 20 PER CENT BY VOLUME OF THE SOLUTION OF ADDED WATER (WHICH SOLUTION CONTAINS ABOUT 24% BY WEIGHT OF TOTAL WATER). AT A TEMPERATURE OF AT LEAST ABOUT 80* C.
Claim 2
Dependent Claim
132 words
A PROCESS FOR BRIGHTENING METAL FROM THE GROUP CONSISTING OF ALUMINUM AND ALLOYS THEREOF WHICH COMPRISES IMMERSING THE METAL IN A BATH HAVING AS THE ESSENTIAL COMPONENTS THEREOF PHOSPHORIC ACID OF THE FORMULA H3PO4 AND WATER, THE WATER BEING PRESENT IN A PROPORTION OF THE PHOSPHORIC ACID AT LEAST EQUAL TO THAT EXISTING IN PHOSPHORIC ACID OF ABOUT S. G. 1.72 (WHICH CONTAINS ABOUT 87.5% BY WEIGHT OF PHOSPHORIC ACID OF THE FORMULA H3PO4 AND ABOUT 12.5% BY WEIGHT OF WATER) AND IN A TOTAL AMOUNT UP TO THAT EXISTING IN A SOLUTION OF PHOSPORIC ACID OF ABOUT S. G. 1.72 AND 20 PER CENT BY VOLUME OF THE SOLUTION OF ADDED WATER (WHICH SOLUTION CONTAINS ABOUT 24% BY WEIGHT OF TOTAL WATER). AT A TEMPERATURE OF AT LEAST ABOUT 80* C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-24 | 1957-02-23 | 1957-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-24 | 1961-02-23 | 1961-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-24 | 1965-02-23 | 1965-08-25 | $7700.00 | Window Closed / Lapsed |