Patent US2805073A successfully refreshed from Google Patents.
US2805073A
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Detachable self locking driving device
Assignee: JH Fletcher and Co
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Filing: 1954-09-07
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Granted: 1957-09-03
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Expires: 1974-09-07
Abstract
No abstract record available.
Inventors
- 👤 William F Fletcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:47
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/24; Y; Y10; Y10S; Y10S279/00; Y10S279/904; Y10T; Y10T403/00; Y10T403/57; Y10T403/5733; Y10T403/70; Y10T403/7075; Y10T403/7077; Y10T403/7079; Y10T74/00; Y10T74/21; Y10T74/2142; Y10T74/2159
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-02 | 1961-03-04 | 1961-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-02 | 1965-03-04 | 1965-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-02 | 1969-03-04 | 1969-09-03 | $7700.00 | Window Closed / Lapsed |