US3283116A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical discharge machining method and apparatus
Assignee: Motors Liquidation Co
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Filing: 1962-05-04
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Granted: 1966-11-01
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Expires: 1982-05-04
Abstract
No abstract record available.
Inventors
- 👤 August F Scarpelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:22
CPC Classifications
B; B23; B23H; B23H1/00; B23H1/02; B23H1/022
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
100 words
IN THE METHOD OF ELECTRICAL STOCK REMOVAL, THE STEPS OF APPLYING INTERMITTENT POWER ACROSS AN IONIZABLE FLUID FILLED GAP FORMED BETWEEN CUTTING TOOL AND WORKPIECE ELECTRODES SO AS TO PRODUCE ELECTRICAL DISCHARGES ACROSS THE GAP FOR ERODING STOCK FROM THE WORKPIECE ELETRODE AND SUPPLYING CURRENT OF THE SAME POLARITY AS AND AT LOWER VOLTAGE THAN DISCHARGE VOLTAGE TO THE GAP BETWEEN THE DISCHARGES AND WHILE THE GAP IS CONDUCTIVE SO AS TO CAUSE A HARDENED LAYER OF MATERIAL TO BE FORMED ON THE CUTTING TOOL ELECTRODE SURFACE FROM THE ERODED STOCK FOR REDUCING THE WEAR OF THE CUTTING TOOL ELECTRODE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-31 | 1970-05-02 | 1970-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-31 | 1974-05-02 | 1974-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-31 | 1978-05-02 | 1978-11-01 | $7700.00 | Window Closed / Lapsed |