US3158728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High voltage-reverse polarity edm
Assignee: Elox Corporation of Michigan
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Filing: 1960-07-26
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Granted: 1964-11-24
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Expires: 1980-07-26
Abstract
No abstract record available.
Inventors
- 👤 Robert S Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:36
CPC Classifications
B; B23; B23H; B23H1/00; B23H1/02; B23H1/022
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
THE PROCESS OF ERODING A CONDUCTIVE WORKPIECE BY MEANS OF ELECTRICAL DISCHARGES ACROSS A GAP BETWEEN THE WORKPIECE AND AN ELECTRODE WHICH COMPRISES, MAINTAINING A DIELECTRIC COOLANT IN THE GAP, SUPPLYING TO THE GAP POWER PULSES OF A POLARITY SUCH THAT THE POLARITY OF THE ELECTRODE IS POSITIVE AND THE POLARITY OF THE WORKPIECE IS NEGATIVE, SAID PULSES OF A VOLTAGE MAGNITUDE AT A PREDETERMINED LEVEL IN EXCESS OF 150 VOLTS, AND MAINTAINING SUFFICIENT GAP SPACING BETWEEN SAID ELECTRODE AND WORKPIECE TO PROVIDE AN ANODIC DISCHARGE AREA ON SAID ELECTRODE SUBSTANTIALLY GREATER THAN THE CATHODIC DISCHARGE AREA ON SAID WORKPIECE.
Claim 2
Dependent Claim
100 words
THE PROCESS OF ERODING A CONDUCTIVE WORKPIECE BY MEANS OF ELECTRICAL DISCHARGES ACROSS A GAP BETWEEN THE WORKPIECE AND AN ELECTRODE WHICH COMPRISES, MAINTAINING A DIELECTRIC COOLANT IN THE GAP, SUPPLYING TO THE GAP POWER PULSES OF A POLARITY SUCH THAT THE POLARITY OF THE ELECTRODE IS POSITIVE AND THE POLARITY OF THE WORKPIECE IS NEGATIVE, SAID PULSES OF A VOLTAGE MAGNITUDE AT A PREDETERMINED LEVEL IN EXCESS OF 150 VOLTS, AND MAINTAINING SUFFICIENT GAP SPACING BETWEEN SAID ELECTRODE AND WORKPIECE TO PROVIDE AN ANODIC DISCHARGE AREA ON SAID ELECTRODE SUBSTANTIALLY GREATER THAN THE CATHODIC DISCHARGE AREA ON SAID WORKPIECE.
References Cited (Backward Citations)
US2235385A
Cited
US2759088A
Cited
US2697160A
Cited
US2951142A
Cited
US2876386A
Cited
US3052817A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-24 | 1968-05-25 | 1968-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-24 | 1972-05-25 | 1972-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-24 | 1976-05-25 | 1976-11-24 | $7700.00 | Window Closed / Lapsed |