US2739883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of etching aluminum
Assignee: Turco Products Inc
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Filing: 1954-07-22
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Granted: 1956-03-27
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Expires: 1974-07-22
Abstract
No abstract record available.
Inventors
- 👤 Newman Kenneth Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:59
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/32; C23F1/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A METHOD OF ETCHING BODIES OF ALUMINUM AND ALUMINUM BASE ALLOYS WHICH COMPRISES TREATING SAID ALUMINUM BODIES WITH AN AQUEOUS ALKALINE SOLUTION WHICH CONTAINS CITRATE IONS AND ALKALI HYDROXIDE, SAID CITRATE IONS BEING PRESENT IN A RATIO TO THE ALKALI HYDROXIDE CHEMICALLY EQUIVALENT TO AT LEAST ABOUT 2.7 PERCENT OF THE COMBINED WEIGHT OF THE CITRATE CALCULATED AS CITRIC ACID AND ALKALI HYDROXIDE CALCULATED AS NAOH, AND ETCHING THE SAID ALUMINUM BODIES BY SAID TREATMENT AND FORMING A PRECIPITATE IN SAID CONTAINER.
Claim 2
Independent Claim
82 words
A METHOD OF ETCHING BODIES OF ALUMINUM AND ALUMINUM BASE ALLOYS WHICH COMPRISES TREATING SAID ALUMINUM BODIES WITH AN AQUEOUS ALKALINE SOLUTION WHICH CONTAINS CITRATE IONS AND ALKALI HYDROXIDE, SAID CITRATE IONS BEING PRESENT IN A RATIO TO THE ALKALI HYDROXIDE CHEMICALLY EQUIVALENT TO AT LEAST ABOUT 2.7 PERCENT OF THE COMBINED WEIGHT OF THE CITRATE CALCULATED AS CITRIC ACID AND ALKALI HYDROXIDE CALCULATED AS NAOH, AND ETCHING THE SAID ALUMINUM BODIES BY SAID TREATMENT AND FORMING A PRECIPITATE IN SAID CONTAINER.
References Cited (Backward Citations)
US2650875A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |