US2431361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retrieving tool for well bores
Assignee: INTERNAT DERRICK AND EQUIPMENT
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Filing: 1945-04-06
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Granted: 1947-11-25
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Expires: 1965-04-06
Abstract
No abstract record available.
Inventors
- 👤 Clifford R Athy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:28
CPC Classifications
E; E21; E21B; E21B31/00; E21B31/06
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) | 1950-11-24 | 1951-05-26 | 1951-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-11-24 | 1955-05-26 | 1955-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-11-24 | 1959-05-26 | 1959-11-25 | $7700.00 | Window Closed / Lapsed |