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US903435A
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Ratchet-lock for screw-joints of well-drilling tools.
Assignee: Individual
•
Filing: 1908-06-13
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Granted: 1908-11-10
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Expires: 1928-06-13
Abstract
No abstract record available.
Inventors
- 👤 William Barrott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:16
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/042; E21B17/043; F; F16; F16B; F16B2200/00; F16B2200/69; F16B2200/73; Y; Y10; Y10S; Y10S411/00; Y10S411/924; Y10S411/95; Y10T; Y10T279/00; Y10T279/17; Y10T279/17931; Y10T279/17941
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1911-11-10 | 1912-05-11 | 1912-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1915-11-10 | 1916-05-11 | 1916-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1919-11-10 | 1920-05-11 | 1920-11-10 | $7700.00 | Window Closed / Lapsed |