Patent US2948514A successfully refreshed from Google Patents.
US2948514A
Expired / Lapsed
US
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Rotary earth drilling apparatus and method
Assignee: Individual
•
Filing: 1955-05-17
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Granted: 1960-08-09
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Expires: 1975-05-17
Abstract
No abstract record available.
Inventors
- 👤 Gebhard J Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:42
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US973752A
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US1908227A
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US2116359A
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US2107475A
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US2641444A
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US2719025A
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US2738163A
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US2783026A
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US2784942A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-09 | 1964-02-08 | 1964-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-09 | 1968-02-08 | 1968-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-09 | 1972-02-08 | 1972-08-09 | $7700.00 | Window Closed / Lapsed |