US2965457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for etching aluminum
Assignee: EIDP Inc
•
Filing: 1957-05-01
•
Granted: 1960-12-20
•
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 11:29
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.
References Cited (Backward Citations)
US2333916A
Cited
US2332497A
Cited
US2676900A
Cited
US2650875A
Cited
US2843659A
Cited
US2653860A
Cited
GB731035A
Cited
US2765216A
Cited
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 |