Patent US2901222A successfully refreshed from Google Patents.
US2901222A
Expired / Lapsed
US
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Rotary drill bit
Assignee: Individual
•
Filing: 1957-10-04
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Granted: 1959-08-25
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Expires: 1977-10-04
Abstract
No abstract record available.
Inventors
- 👤 Jr George W Pease
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:06
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/54; Y; Y10; Y10T; Y10T407/00; Y10T407/19; Y10T407/1906; Y10T407/1908; Y10T407/26; Y10T407/27; Y10T408/00; Y10T408/78; Y10T408/89; Y10T408/905; Y10T408/906
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US977955A
Cited
US1413471A
Cited
US1407927A
Cited
US1897267A
Cited
US2545195A
Cited
US2511991A
Cited
US2696973A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |