US2796335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum etching
Assignee: Alcoa Corp
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Filing: 1955-04-13
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Granted: 1957-06-18
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Expires: 1975-04-13
Abstract
No abstract record available.
Inventors
- 👤 Donald L Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:22
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
A PROCESS FOR TREATING ALUMINUM TO INCREASE ITS EFFECTIVE SURFACE AREA, WHICH COMPRISES CHEMICALLY ETCHING THE ALUMINUM BY IMMERSION FOR ABOUT 3/4 TO 2 MINUTES IN A SOLUTION MAINTAINED AT ABOUT 70 TO 100*C. AND CONSISTING ESSENTIALLY OF ABOUT 0.2 TO 0.6 PERCENT BY WEIGHT DISSOLVED NITRATE (NO3-), ABOUT 1 TO 10 PERCENT SODIUM CHLORIDE, ABOUT 0.2 TO 0.6 PERCENT DISSOLVED BIVALENT COPPER(CU++), AND WATER.
Claim 2
Dependent Claim
65 words
A PROCESS FOR TREATING ALUMINUM TO INCREASE ITS EFFECTIVE SURFACE AREA, WHICH COMPRISES CHEMICALLY ETCHING THE ALUMINUM BY IMMERSION FOR ABOUT 3/4 TO 2 MINUTES IN A SOLUTION MAINTAINED AT ABOUT 70 TO 100*C. AND CONSISTING ESSENTIALLY OF ABOUT 0.2 TO 0.6 PERCENT BY WEIGHT DISSOLVED NITRATE (NO3-), ABOUT 1 TO 10 PERCENT SODIUM CHLORIDE, ABOUT 0.2 TO 0.6 PERCENT DISSOLVED BIVALENT COPPER(CU++), AND WATER.
References Cited (Backward Citations)
US567926A
Cited
US1681499A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-06-17 | 1960-12-17 | 1961-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-17 | 1964-12-17 | 1965-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-17 | 1968-12-17 | 1969-06-18 | $7700.00 | Window Closed / Lapsed |