Patent US2793992A successfully refreshed from Google Patents.
US2793992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical cutting and grinding
Assignee: Motors Liquidation Co
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Filing: 1953-04-06
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Granted: 1957-05-28
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Expires: 1973-04-06
Abstract
No abstract record available.
Inventors
- 👤 Helmut C Heuser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:23
CPC Classifications
B; B23; B23H; B23H5/00; B23H5/06; B23H5/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A METHOD OF GRINDING A HARD ELECTROCONDUCTIVE MATERIAL TO OBTAIN A DESIRED SHAPE WHILE SIMULTANEOUSLY PROVIDING SAID MATERIAL WITH AN EXTREMELY SMOOTH SURFACE, SAID METHOD COMPRISING ELECTRICALL CONNECTING SAID ELECTROCONDUCTIVE MATERIAL TO THE POSITIVE TERMINAL OF A SOURCE OF PULSATING DIRECT CURRENT OF 10 TO 30 VOLTS, CONNECTING TO THE NEGATIVE TERMINAL OF SAID SOURCE OF PULASTING DIRECT CURRENT A WHEEL ELECTRODE HAVING A GRINDING SURFACE FORMED OF A GENERALLY UNIFORM MIXTURE OF ALUMINUM OXIDE PARTICLES BOUND TOGETHER BY A METAL CONDUCTOR, ROTATING SAID WHEEL ELECTRODE SUPPLYING AN AQUEOUS SOLUTION OF SODIUM SILICATE AND SODIUM CARBONATE TO THE ROTATING WHEEL ELECTRODE TO PROVIDE A THIN FILM OF SAID SOLUTION ON SAID GRINDING SURFACE, PASSING A CURRENT OF 300 TO 350 AMPERES PER SQUARE INCH BETWWEN SAID GRINDING SURFACE AND SAID ELECTROCONDUCTIVE MATERIAL, PRESSING SAID ELECTROCONDUCTIVE
Claim 2
Independent Claim
135 words
A METHOD OF GRINDING A HARD ELECTROCONDUCTIVE MATERIAL TO OBTAIN A DESIRED SHAPE WHILE SIMULTANEOUSLY PROVIDING SAID MATERIAL WITH AN EXTREMELY SMOOTH SURFACE, SAID METHOD COMPRISING ELECTRICALL CONNECTING SAID ELECTROCONDUCTIVE MATERIAL TO THE POSITIVE TERMINAL OF A SOURCE OF PULSATING DIRECT CURRENT OF 10 TO 30 VOLTS, CONNECTING TO THE NEGATIVE TERMINAL OF SAID SOURCE OF PULASTING DIRECT CURRENT A WHEEL ELECTRODE HAVING A GRINDING SURFACE FORMED OF A GENERALLY UNIFORM MIXTURE OF ALUMINUM OXIDE PARTICLES BOUND TOGETHER BY A METAL CONDUCTOR, ROTATING SAID WHEEL ELECTRODE SUPPLYING AN AQUEOUS SOLUTION OF SODIUM SILICATE AND SODIUM CARBONATE TO THE ROTATING WHEEL ELECTRODE TO PROVIDE A THIN FILM OF SAID SOLUTION ON SAID GRINDING SURFACE, PASSING A CURRENT OF 300 TO 350 AMPERES PER SQUARE INCH BETWWEN SAID GRINDING SURFACE AND SAID ELECTROCONDUCTIVE MATERIAL, PRESSING SAID ELECTROCONDUCTIVE
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-05-27 | 1960-11-26 | 1961-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-27 | 1964-11-26 | 1965-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-27 | 1968-11-26 | 1969-05-28 | $7700.00 | Window Closed / Lapsed |