US3257580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fault detection and cut-off circuit for electrical discharge machining apparatus
Assignee: Elox Corporation of Michigan
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Filing: 1961-05-26
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Granted: 1966-06-21
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Expires: 1981-05-26
Abstract
No abstract record available.
Inventors
- 👤 Robert S Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:54
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/10; H02H7/12; H02H7/125; H02H7/127; B; B23; B23H; B23H1/00; B23H1/02; B23H1/026
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
IN AN ELECTRICAL MACHINING APPARATUS HAVING AN ELECTRONIC SWITCH INCLUDING A PAIR OF POWER ELECTRODES, SAID POWER ELECTRODES CONNECTED BETWEEN A POWER SOURCE AND AN OPERATIVE PORTION OF THE APPARATUS, MEANS FOR PULSING SAID ELECTRONIC SWITCH ALTERNATELY CONDUCTIVE AND NONCONDUCTIVE AT SELECTED FREQUENCY, MEANS FOR DETECTING LEAKAGE THROUGH THE POWER ELECTRODE OF SAID ELECTRONIC SWITCH DURING ITS NONCONDUCTING PERIOD OF OPERATION, AND CUT-OFF MEANS OPERABLE IN RESPONSE TO DETECTION OF LEAKAGE OF PREDETERMINED AMOUNT BY SAID DETECTING MEANS FOR CUTTING OFF SAID POWER SOURCE.
Claim 2
Dependent Claim
84 words
IN AN ELECTRICAL MACHINING APPARATUS HAVING AN ELECTRONIC SWITCH INCLUDING A PAIR OF POWER ELECTRODES, SAID POWER ELECTRODES CONNECTED BETWEEN A POWER SOURCE AND AN OPERATIVE PORTION OF THE APPARATUS, MEANS FOR PULSING SAID ELECTRONIC SWITCH ALTERNATELY CONDUCTIVE AND NONCONDUCTIVE AT SELECTED FREQUENCY, MEANS FOR DETECTING LEAKAGE THROUGH THE POWER ELECTRODE OF SAID ELECTRONIC SWITCH DURING ITS NONCONDUCTING PERIOD OF OPERATION, AND CUT-OFF MEANS OPERABLE IN RESPONSE TO DETECTION OF LEAKAGE OF PREDETERMINED AMOUNT BY SAID DETECTING MEANS FOR CUTTING OFF SAID POWER SOURCE.
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) | 1969-06-20 | 1969-12-20 | 1970-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-20 | 1973-12-20 | 1974-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-20 | 1977-12-20 | 1978-06-21 | $7700.00 | Window Closed / Lapsed |