Patent US3650940A successfully refreshed from Google Patents.
US3650940A
Expired / Lapsed
US
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Device for limiting the power supply upon short-circuit between workpiece and tool in electrolytic metal forming machine
Assignee: Siemens AG
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Filing: 1969-02-19
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Granted: 1972-03-21
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Expires: 1989-02-19
Abstract
Abstract The supply of power to an electrolytic metal forming machine is limited in response to an abrupt voltage change between its electrodes. A control circuit connected to the device controls it to limit the power. The control circuit has a voltage-responsive input member connected in series with a capacitor between the electrodes of the machine and in shunt with the gap between the electrodes.
Inventors
- 👤 Nils Bardahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:02
CPC Classifications
H; H02; H02H; H02H7/00; B; B23; B23H; B23H3/00; B23H3/02; H02H3/00; H02H3/44; H02H3/445
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) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |