Patent US3761380A successfully refreshed from Google Patents.
US3761380A
Expired / Lapsed
US
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Adaptive spark detection system for an electrochemical machining apparatus
Assignee: RTX Corp
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Filing: 1971-11-24
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Granted: 1973-09-25
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Expires: 1991-11-24
Abstract
Abstract Apparatus for terminating an electrochemical machining process is concurrently responsive to the electrolyzing current and changes of voltage in the gap between one or more electrodes and the workpiece, the invention thereby automatically adapting itself to a plurality of electrochemical process.
Inventors
- 👤 N Ballard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:11
CPC Classifications
B; B23; B23H; B23H3/00; B23H3/02
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |