US2640685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric drilling mechanism
Assignee: Individual
•
Filing: 1946-10-11
•
Granted: 1953-06-02
•
Expires: 1966-10-11
Abstract
No abstract record available.
Inventors
- 👤 Charles M O'leary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:46
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/084
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US758293A
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US1703234A
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US1838956A
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US1745094A
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US1836998A
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US1785163A
Cited
US1859814A
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US2032155A
Cited
US2193683A
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US2462747A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |