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Patent US2872301A successfully refreshed from Google Patents.
US2872301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical composition and process for aluminum etching
Assignee: Pennwalt Corp
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Filing: 1955-03-31
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Granted: 1959-02-03
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Expires: 1975-03-31
Abstract
No abstract record available.
Inventors
- 👤 John T Massengale
- 👤 Jr Robert H Elliott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:53
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/32; C23F1/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
THE METHOD OF ETCHING ALUMIUM COMPRISING TREATING SAID ALUMIUM AT AN ETCHING TEMPERATURE WITH AN AQUEOUS SOLUTION OF AN ETCHING ALKALI CONTAINING, IN AN AMOUNT SUFFICIENT TP PREVENT SCALE FORMATION, A HYDROXY AMINE HAVING THE GENERAL EMPIRICAL FORMULA
Claim 2
Independent Claim
38 words
THE METHOD OF ETCHING ALUMIUM COMPRISING TREATING SAID ALUMIUM AT AN ETCHING TEMPERATURE WITH AN AQUEOUS SOLUTION OF AN ETCHING ALKALI CONTAINING, IN AN AMOUNT SUFFICIENT TP PREVENT SCALE FORMATION, A HYDROXY AMINE HAVING THE GENERAL EMPIRICAL FORMULA
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) | 1962-02-02 | 1962-08-04 | 1963-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-02 | 1966-08-04 | 1967-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-02 | 1970-08-04 | 1971-02-03 | $7700.00 | Window Closed / Lapsed |