Patent US4897191A successfully refreshed from Google Patents.
Patent US3083129A successfully refreshed from Google Patents.
US3083129A
Expired / Lapsed
US
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Method of etching copper with rejuvenation and recycling
Assignee: General Dynamics Corp
•
Filing: 1958-10-01
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Granted: 1963-03-26
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Expires: 1978-10-01
Abstract
No abstract record available.
Inventors
- 👤 Jones Augustus
- 👤 Fred J Haskins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:28
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
IN THE PROESS OF ETCHING COPPER WITH AN ETCHING BATH OF A COPPER HALIDE OF THE GROUP CONSISTING OF CUPRIC CHLORIDE AND CUPRIC BROMIDE, THE IMPROVEMENT COMPRISING REMOVING A PORTION OF THE COPPER HALIDE AS CUPROUS HALIDE FROM THE SPENT ETCHING MIXTURE AND REJUVENATING
Claim 2
Dependent Claim
44 words
IN THE PROESS OF ETCHING COPPER WITH AN ETCHING BATH OF A COPPER HALIDE OF THE GROUP CONSISTING OF CUPRIC CHLORIDE AND CUPRIC BROMIDE, THE IMPROVEMENT COMPRISING REMOVING A PORTION OF THE COPPER HALIDE AS CUPROUS HALIDE FROM THE SPENT ETCHING MIXTURE AND REJUVENATING
References Cited (Backward Citations)
US2235658A
Cited
US2233546A
Cited
US2378052A
Cited
US2668130A
Cited
US2886420A
Cited
US2908557A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-03-25 | 1966-09-24 | 1967-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-25 | 1970-09-24 | 1971-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-25 | 1974-09-24 | 1975-03-26 | $7700.00 | Window Closed / Lapsed |