US2939825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sharpening, shaping and finishing of electrically conductive materials
Assignee: Cleveland Twist Drill Co
•
Filing: 1956-04-09
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Granted: 1960-06-07
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Expires: 1976-04-09
Abstract
No abstract record available.
Inventors
- 👤 Charles L Faust
- 👤 John E Clifford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 03:26
CPC Classifications
B; B23; B23H; B23H9/00; B23H9/08; C; C25; C25F; C25F3/00; B23H7/00; B23H7/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
THE METHOD OF SHARPENING, SHAPING AND FINISHING AN ELECTRICALLY CONDUCTIVE BODY BY REMOVING STOCK THEREFROM, WHICH COMPRISES METERING A THIN LAYER OF ELECTROLYTE ONTO A SMOOTH ELECTRICALLY CONDUCTING SURFACE MOVING AT HIGH SPEED TO FORM A CONDUCTIVELY SUPPORTED FILM OF THE ELECTROLYTE WITHIN THE RANGE OF FROM ABOUT 0.001 TO ABOUT 0.008 INCH MOVING RAPIDLY IN STREAMLINE, NON-TURBULENT FLOW, THEREAFTER DISPOSING THE SURFACE OF SAID BODY FROM WHICH STOCK IS TO BE REMOVED IN CONTACT WITH THE THUS PREFORMED FILM OF ELECTROLYTE, APPLYING DIRECT CURRENT VOLTAGE ACROSS THE BODY AS AN ANODE AND THE CONDUCTIVE FILM-SUPPORTING SURFACE AS A CATHODE TO REMOVE STOCK FROM THE BODY, AND MAINTAINING SUCH SURFACE OF SAID BODY IN CONTACT WITH THE ELECTROLYTE FILM BUT SPACED FROM THE CONDUCTING SURFACE SUPPORTING THE SAME DURING SUCH STOCK REMOVAL OPERATION.
Claim 2
Independent Claim
133 words
THE METHOD OF SHARPENING, SHAPING AND FINISHING AN ELECTRICALLY CONDUCTIVE BODY BY REMOVING STOCK THEREFROM, WHICH COMPRISES METERING A THIN LAYER OF ELECTROLYTE ONTO A SMOOTH ELECTRICALLY CONDUCTING SURFACE MOVING AT HIGH SPEED TO FORM A CONDUCTIVELY SUPPORTED FILM OF THE ELECTROLYTE WITHIN THE RANGE OF FROM ABOUT 0.001 TO ABOUT 0.008 INCH MOVING RAPIDLY IN STREAMLINE, NON-TURBULENT FLOW, THEREAFTER DISPOSING THE SURFACE OF SAID BODY FROM WHICH STOCK IS TO BE REMOVED IN CONTACT WITH THE THUS PREFORMED FILM OF ELECTROLYTE, APPLYING DIRECT CURRENT VOLTAGE ACROSS THE BODY AS AN ANODE AND THE CONDUCTIVE FILM-SUPPORTING SURFACE AS A CATHODE TO REMOVE STOCK FROM THE BODY, AND MAINTAINING SUCH SURFACE OF SAID BODY IN CONTACT WITH THE ELECTROLYTE FILM BUT SPACED FROM THE CONDUCTING SURFACE SUPPORTING THE SAME DURING SUCH STOCK REMOVAL OPERATION.
References Cited (Backward Citations)
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Cited
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US2739935A
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US2827427A
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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) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |