US2533260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary drill bit and cutter therefor
Assignee: Hughes Tool Co
•
Filing: 1946-10-07
•
Granted: 1950-12-12
•
Expires: 1966-10-07
Abstract
No abstract record available.
Inventors
- 👤 Henry B Woods
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:26
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1867531A
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US1896251A
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US1863084A
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US1871736A
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US2177332A
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US2310289A
Cited
US2333746A
Cited
US2370070A
Cited
US2363202A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-11 | 1954-06-12 | 1954-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-11 | 1958-06-12 | 1958-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-11 | 1962-06-12 | 1962-12-12 | $7700.00 | Window Closed / Lapsed |