US3089549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling apparatus
Assignee: Individual
•
Filing: 1960-03-03
•
Granted: 1963-05-14
•
Expires: 1980-03-03
Abstract
No abstract record available.
Inventors
- 👤 Robbins Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:58
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1932068A
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US2823898A
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US2771271A
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US2868508A
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US2879034A
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US2849212A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-05-13 | 1966-11-12 | 1967-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-13 | 1970-11-12 | 1971-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-13 | 1974-11-12 | 1975-05-14 | $7700.00 | Window Closed / Lapsed |