US2648526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary earth boring bit
Assignee: CLYDE DRILLING AND PROSPECTING
•
Filing: 1947-10-06
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Granted: 1953-08-11
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Expires: 1967-10-06
Abstract
No abstract record available.
Inventors
- 👤 Lanchester George Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:39
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1816204A
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US1992992A
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US2065743A
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US2075997A
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US2334359A
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US2370070A
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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) | 1956-08-10 | 1957-02-09 | 1957-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-10 | 1961-02-09 | 1961-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-10 | 1965-02-09 | 1965-08-11 | $7700.00 | Window Closed / Lapsed |