US2882134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for aluminum etching
Assignee: Pennwalt Corp
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Filing: 1954-12-08
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Granted: 1959-04-14
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Expires: 1974-12-08
Abstract
No abstract record available.
Inventors
- 👤 Spring Samuel
- 👤 Jr Robert Houston Elliott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:52
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/32; C23F1/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A METHOD OF ETCHING ALUMINUM WHICH COMPRISES SUBJECTING THE ALUMINUM TO THE ACTION OF AN ETCHING SOLUTION HAVING A TEMPERATURE OF 120 TO 180*F. SAID ETCHING SOLUTION CONTAINING A CONCENTRATON OF ABOUT 1 TO ABOUT 15% OF AN ETCHING ALKALI SELECTED FROM THE CLASS CONSISTING OF SODIUM AND POTASSIUM ALKALIES, ABOUT 4% TO ABOUT 10% BY WEIGHT, BASED UPON THE ETCHING ALKALI CONTENT OF THE SOLUTION, OF TARTARIC ACID, AND ABOUT 0.2 TO ABOUT 1.0% BY WEIGHT, BASED UPON THE ETCHING ALKALI CONTENT TO THE SOLUTION, OF AN ALKALI METAL SALT OF ETHYLENE DEIMINE-TETRACETIC ACID.
Claim 2
Independent Claim
95 words
A METHOD OF ETCHING ALUMINUM WHICH COMPRISES SUBJECTING THE ALUMINUM TO THE ACTION OF AN ETCHING SOLUTION HAVING A TEMPERATURE OF 120 TO 180*F. SAID ETCHING SOLUTION CONTAINING A CONCENTRATON OF ABOUT 1 TO ABOUT 15% OF AN ETCHING ALKALI SELECTED FROM THE CLASS CONSISTING OF SODIUM AND POTASSIUM ALKALIES, ABOUT 4% TO ABOUT 10% BY WEIGHT, BASED UPON THE ETCHING ALKALI CONTENT OF THE SOLUTION, OF TARTARIC ACID, AND ABOUT 0.2 TO ABOUT 1.0% BY WEIGHT, BASED UPON THE ETCHING ALKALI CONTENT TO THE SOLUTION, OF AN ALKALI METAL SALT OF ETHYLENE DEIMINE-TETRACETIC ACID.
References Cited (Backward Citations)
US2584017A
Cited
US2650875A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-13 | 1962-10-13 | 1963-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-13 | 1966-10-13 | 1967-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-13 | 1970-10-13 | 1971-04-14 | $7700.00 | Window Closed / Lapsed |