US3749653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of electrolytic etching
Assignee: Metalectric Inc
•
Filing: 1971-08-17
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Granted: 1973-07-31
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Expires: 1991-08-17
Abstract
Abstract AN ELECTROLYTIC ETCHING SYSTEM FOR THE TYPE IN WHICH AN ANODE-WORKPIECE AND A CATHODE ARE LOCATED IN AN ELECTROLYTIC SOLUTION. THE UNDESIRABLE INSULATIVE COATING WHICH IS GENERALLY PROVIDED ON THE CATHODE DURING ETCHING IS ALLEVIATED BY APPLYING AN ALTERNATING ELECTRIC POTENTIAL ACROSS THE WORKPIECE-FACING SURFACE OF THE CATHODE WHILE A VOLTAGE IS SIMULTANEOUSLY APPLIED ACROSS THE ANODE AND CATHODE.
Inventors
- 👤 C Trzyna
- 👤 Q Krantz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:10
CPC Classifications
C; C25; C25F; C25F3/00; C25F3/02; Y; Y10; Y10S; Y10S204/00; Y10S204/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |