Patent US2903555A successfully refreshed from Google Patents.
US2903555A
Expired / Lapsed
US
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Electrode position control for spark machining apparatus
Assignee: Firth Sterling Inc
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Filing: 1957-03-11
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Granted: 1959-09-08
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Expires: 1977-03-11
Abstract
No abstract record available.
Inventors
- 👤 Porterfield Cecil Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:27
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/14; B23H7/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR1062480A
Cited
GB748544A
Cited
FR1065986A
Cited
US2761050A
Cited
US2773168A
Cited
US2762946A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-07 | 1963-03-09 | 1963-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-07 | 1967-03-09 | 1967-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-07 | 1971-03-09 | 1971-09-08 | $7700.00 | Window Closed / Lapsed |