US3275538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochemical machining method and apparatus
Assignee: Motors Liquidation Co
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Filing: 1960-09-20
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Granted: 1966-09-27
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Expires: 1980-09-20
Abstract
No abstract record available.
Inventors
- 👤 Robert H Haupt
- 👤 Glenn E Wanttaja
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:06
CPC Classifications
B; B23; B23H; B23H3/00; B23H3/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
IN ELECTROCHEMICAL MACHINING APPARATUS, THE COMBINATION OF CONDUCTIVE TOOL AND WORKPIECE ELECTRODES SPACED APART SO AS TO PROVIDE A CONDUCTIVE MEDIUM FILLED GAP THEREBETWEEN, AND A SOURCE ELECTRICAL ENERGY APPLIED ACROSS THE GAP SO AS TO CAUSE STOCK TO BE REMOVED FROM THE WORKPIECE ELECTRODE, THE SOURCE INCLUDING MEANS DEVELOPING AN ERROR SIGNAL CORRESPONDING TO VARIATIONS IN GAP VOLTAGE RELATIVE TO A PREDETERMINED REFERENCE AND MEANS OPERATED BY THE ERROR SIGNAL FOR VARYING THE OUTPUT OF THE SOURCE SO AS TO CAUSE THE GAP VOLTAGE TO CORRESPOND TO THE PREDETERMINED REFERENCE REGARDLESS OF GAP SPACING.
Claim 2
Dependent Claim
171 words
IN THE METHOD OF PERIODICALLY ADJUSTING THE SPACING OF A CONDUCTIVE TOOL ELECTRODE AND A CONDUCTIVE WORKPIECE RELATIVE TO EACH OTHER DURING THE ELECTROCHEMICAL MACHINING PROCESS OF REMOVING STOCK FROM THE WORKPIECE, THE REPETITIVE STEPS INCLUDING POSITIONING THE WORKPIECE AND THE ELECTRODE RELATIVE TO EACH OTHER SO AS TO FORM A PREDETERMINED GAP THEREBETWEEN, APPLYING ELECTRICAL ENERGY ACROSS THE GAP, MOVING THE ELECTRODE AND THE WORKPIECE TOWARDS EACH OTHER SO AS TO EFFECT STOCK REMOVAL FROM THE WORKPIECE, INTERRUPTING THE APPLICATION OF THE ELECTRICAL ENERGY ACROSS THE GAP SO AS TO STOP THE STOCK REMOVAL PROCESS AFTER A PREDETERMINED INTERVAL, APPLYING A VOLTAGE ACROSS THE GAP, MOVING THE ELECTRODE AND THE WORKPIECE RELATIVE TO EACH OTHER IN A GAP SPACE REDUCING DIRECTION WHILE SENSING THE GAP VOLTAGE, STOPPING THE RELATIVE MOVEMENT OF THE ELECTRODE AND THE WORKPIECE IN THE GAP SPACE REDUCING DIRECTION WHEN THE GAP VOLTAGE IS OF A CERTAIN VALUE, SEPARATING THE ELECTRODE AND THE WORKPIECE UNTIL THE PREDETERMINED GAP IS RE-ESTABLISHED THEREBETWEEN, AND RECOMMENCING THE STOCK REMOVAL PROCESS.
References Cited (Backward Citations)
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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) | 1969-09-26 | 1970-03-28 | 1970-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-26 | 1974-03-28 | 1974-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-26 | 1978-03-28 | 1978-09-27 | $7700.00 | Window Closed / Lapsed |