US2746719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling device for large bores
Assignee: Individual
•
Filing: 1952-05-22
•
Granted: 1956-05-22
•
Expires: 1972-05-22
Abstract
No abstract record available.
Inventors
- 👤 Alain R Seligman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:08
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US959540A
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DE427535C
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US1993365A
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US2035888A
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US2058628A
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US2074003A
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US2349033A
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US2281614A
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US2664273A
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US2684834A
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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) | 1959-05-22 | 1959-11-21 | 1960-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-22 | 1963-11-21 | 1964-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-22 | 1967-11-21 | 1968-05-22 | $7700.00 | Window Closed / Lapsed |