US2666622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detachable blade bit
Assignee: Individual
•
Filing: 1947-12-29
•
Granted: 1954-01-19
•
Expires: 1967-12-29
Abstract
No abstract record available.
Inventors
- 👤 Herbert J Hawthorne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:07
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/62; E21B10/627; Y; Y10; Y10T; Y10T403/00; Y10T403/44; Y10T403/447; Y10T403/70; Y10T403/7009
Claims Analysis
Total Claims: 0
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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) | 1957-01-18 | 1957-07-20 | 1958-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-18 | 1961-07-20 | 1962-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-18 | 1965-07-20 | 1966-01-19 | $7700.00 | Window Closed / Lapsed |