US3281293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of etching aluminum
Assignee: Chemcut Corp
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Filing: 1963-07-19
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Granted: 1966-10-25
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Expires: 1983-07-19
Abstract
No abstract record available.
Inventors
- 👤 George D Woodring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:42
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
THE METHOD OF ETCHING ALUMINUM WITH AN AQUEOUS FERRIC CHLORIDE SOLUTION, WHICH INCLUDES THE ADDITION, TO THE GALLON OF THE SOLUTION, OF AT LEAST 0.12 POUND OF PERSULFATE SALT TO PREVENT THE FORMATION OF UNWANTED SMUT AND TO SUSTAIN THE ETCHING ACTION BY THE FERRIC CHLORIDE IN THE SOLUTION, AND APPLYING SUCH SOLUTION TO ALUMINUM TO ETCH SAME.
Claim 2
Independent Claim
58 words
THE METHOD OF ETCHING ALUMINUM WITH AN AQUEOUS FERRIC CHLORIDE SOLUTION, WHICH INCLUDES THE ADDITION, TO THE GALLON OF THE SOLUTION, OF AT LEAST 0.12 POUND OF PERSULFATE SALT TO PREVENT THE FORMATION OF UNWANTED SMUT AND TO SUSTAIN THE ETCHING ACTION BY THE FERRIC CHLORIDE IN THE SOLUTION, AND APPLYING SUCH SOLUTION TO ALUMINUM TO ETCH SAME.
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) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |