Patent US2039945A successfully refreshed from Google Patents.
US2039945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Locked drilling safety joint
Assignee: Individual
•
Filing: 1935-07-01
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Granted: 1936-05-05
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Expires: 1955-07-01
Abstract
No abstract record available.
Inventors
- 👤 Harry P Wickersham
- 👤 Harley J Craig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:37
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/06; F; F16; F16B; F16B2200/00; F16B2200/69; F16B2200/73; Y; Y10; Y10S; Y10S285/00; Y10S285/922
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) | 1939-05-05 | 1939-11-04 | 1940-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-05-05 | 1943-11-04 | 1944-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-05-05 | 1947-11-04 | 1948-05-05 | $7700.00 | Window Closed / Lapsed |