Patent US2965457A successfully refreshed from Google Patents.
US2965457A
Expired / Lapsed
US
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Process for etching aluminum
Assignee: EIDP Inc
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Filing: 1957-05-01
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Granted: 1960-12-20
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Expires: 1977-05-01
Abstract
No abstract record available.
Inventors
- 👤 Owen B Mathre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:01
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/32; C23F1/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
THE METHOD OF CHEMICAL MILLING OF ALUMINUM AND ALUMINUM-RICH ALLOY STOCK WHICH COMPRISES IMMERSING SAID STOCK INTO AN AQUEOUS ALKALI METAL HYDROXIDE ETCHING SOLUTION HAVING A TEMPERATURE BETWEEN 25*C. AND 90*C. AND CONTAINING BETWEEN 0.2% AND THE LIMIT OF ITS SOLUBILITY IN SAID SOLUTION OF AN ALKALI METAL MONOPERPHOSPHATE.
Claim 2
Independent Claim
49 words
THE METHOD OF CHEMICAL MILLING OF ALUMINUM AND ALUMINUM-RICH ALLOY STOCK WHICH COMPRISES IMMERSING SAID STOCK INTO AN AQUEOUS ALKALI METAL HYDROXIDE ETCHING SOLUTION HAVING A TEMPERATURE BETWEEN 25*C. AND 90*C. AND CONTAINING BETWEEN 0.2% AND THE LIMIT OF ITS SOLUBILITY IN SAID SOLUTION OF AN ALKALI METAL MONOPERPHOSPHATE.
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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) | 1963-12-20 | 1964-06-20 | 1964-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-20 | 1968-06-20 | 1968-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-20 | 1972-06-20 | 1972-12-20 | $7700.00 | Window Closed / Lapsed |