Patent US1639057A successfully refreshed from Google Patents.
Patent US3213257A successfully refreshed from Google Patents.
US3213257A
Expired / Lapsed
US
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Electrical stock removal apparatus
Assignee: Motors Liquidation Co
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Filing: 1960-07-19
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Granted: 1965-10-19
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Expires: 1980-07-19
Abstract
No abstract record available.
Inventors
- 👤 Millard A Ferguson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:30
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/14; B23H7/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
IN ELECTRICAL STOCK REMOVAL APPARATUS, THE COMBINATION OF CONDUCTIVE TOOL AND WORKPIECE ELECTRODES SPACED APART SO AS TO FORM A GAP THEREBETWEEN, AN A.C. SOURCE OF ENERGY HAVING A CERTAIN FREQUENCY, A PARALLEL RESONANT CIRCUIT ENERGIZED BY AND TUNED TO A FREQUENCY CORRESPONDING TO THE CERTAIN FREQUENCY OF THE SOURCE, AND MEANS COUPLING BOTH THE SOURCE AND THE PARALLEL RESONANT
Claim 2
Dependent Claim
60 words
IN ELECTRICAL STOCK REMOVAL APPARATUS, THE COMBINATION OF CONDUCTIVE TOOL AND WORKPIECE ELECTRODES SPACED APART SO AS TO FORM A GAP THEREBETWEEN, AN A.C. SOURCE OF ENERGY HAVING A CERTAIN FREQUENCY, A PARALLEL RESONANT CIRCUIT ENERGIZED BY AND TUNED TO A FREQUENCY CORRESPONDING TO THE CERTAIN FREQUENCY OF THE SOURCE, AND MEANS COUPLING BOTH THE SOURCE AND THE PARALLEL RESONANT
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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) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |