US2531930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well drilling structure provided with a drill pipe hoist
Assignee: Lee C Moore Corp
•
Filing: 1947-12-02
•
Granted: 1950-11-28
•
Expires: 1967-12-02
Abstract
No abstract record available.
Inventors
- 👤 Homer J Woolslayer
- 👤 Jenkins Cecil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:31
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE50026C
Cited
US1634859A
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US1924477A
Cited
US2096600A
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US2226947A
Cited
US2328925A
Cited
US2412020A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-27 | 1954-05-29 | 1954-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-27 | 1958-05-29 | 1958-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-27 | 1962-05-29 | 1962-11-28 | $7700.00 | Window Closed / Lapsed |