US3120619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistorized electric discharge machining circuit
Assignee: Elox Corporation of Michigan
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Filing: 1961-04-13
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Granted: 1964-02-04
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Expires: 1981-04-13
Abstract
No abstract record available.
Inventors
- 👤 Robert S Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:00
CPC Classifications
B; B23; B23H; B23H1/00; B23H1/02; B23H1/022
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
IN AN ELECTRICAL DISCHARGE MACHINING APPARATUS FOR MACHINING A CONDUCTIVE WORKPIECE BY MEANS OF SHORTDURATION, DISCRETE, EROSIVE, ELECTRICAL DISCHARGES BETWEEN AN ELECTRODE AND THE WORKPIECE ACROSS A DIELECTRIC FLUID FILLED GAP, A SOURCE OF UNIDIRECTIONAL VOLTAGE, A TRANSISTOR DEVICE CONNECTED IN SERIES WITH SAID SOURCE AND SAID GAP, PULSER DEVICE OPERABLY ASSOCIATED WITH SAID TRANSISTOR MEANS OPERABLE TO RENDER SAID TRANSISTOR MEANS ALTERNATELY, SHARPLY, CONDUCTIVE FOR SELECTED PERIODS AND NONCONDUCTIVE FOR SELECTED PERIODS, AT SELECTED FREQUENCY, AND MEANS OPERATIVELY CONNECTED TO THE CONTROL ELECTRODE OF SAID TRANSISTOR DEVICE FOR ACCELERATING TURN-ON OF SAID TRANSISTOR DEVICE INCLUDING MEANS FOR PROVIDING DRIVE CURRENT SUBSTANTIALLY IN EXCESS OF NORMAL DURING THE INITIAL PORTIONS OF THE CONDUCTIVE PERIODS OF SAID TRANSISTOR DEVICE.
Claim 2
Dependent Claim
118 words
IN AN ELECTRICAL DISCHARGE MACHINING APPARATUS FOR MACHINING A CONDUCTIVE WORKPIECE BY MEANS OF SHORTDURATION, DISCRETE, EROSIVE, ELECTRICAL DISCHARGES BETWEEN AN ELECTRODE AND THE WORKPIECE ACROSS A DIELECTRIC FLUID FILLED GAP, A SOURCE OF UNIDIRECTIONAL VOLTAGE, A TRANSISTOR DEVICE CONNECTED IN SERIES WITH SAID SOURCE AND SAID GAP, PULSER DEVICE OPERABLY ASSOCIATED WITH SAID TRANSISTOR MEANS OPERABLE TO RENDER SAID TRANSISTOR MEANS ALTERNATELY, SHARPLY, CONDUCTIVE FOR SELECTED PERIODS AND NONCONDUCTIVE FOR SELECTED PERIODS, AT SELECTED FREQUENCY, AND MEANS OPERATIVELY CONNECTED TO THE CONTROL ELECTRODE OF SAID TRANSISTOR DEVICE FOR ACCELERATING TURN-ON OF SAID TRANSISTOR DEVICE INCLUDING MEANS FOR PROVIDING DRIVE CURRENT SUBSTANTIALLY IN EXCESS OF NORMAL DURING THE INITIAL PORTIONS OF THE CONDUCTIVE PERIODS OF SAID TRANSISTOR DEVICE.
References Cited (Backward Citations)
US2951969A
Cited
US3020448A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-02-03 | 1967-08-05 | 1968-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-03 | 1971-08-05 | 1972-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-03 | 1975-08-05 | 1976-02-04 | $7700.00 | Window Closed / Lapsed |