US2944796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary expansible drill bits
Assignee: Baker Hughes Oilfield Operations LLC
•
Filing: 1955-06-20
•
Granted: 1960-07-12
•
Expires: 1975-06-20
Abstract
No abstract record available.
Inventors
- 👤 Reuben C Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:47
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/26; E21B10/32; E21B10/322
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1933749A
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US1857616A
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US1995389A
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US2034074A
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US2031353A
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US2203998A
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US2141111A
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US2457628A
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US2644673A
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US2719700A
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US2755070A
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US2822149A
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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) | 1963-07-12 | 1964-01-11 | 1964-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-12 | 1968-01-11 | 1968-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-12 | 1972-01-11 | 1972-07-12 | $7700.00 | Window Closed / Lapsed |