US2969845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill pipe saving device
Assignee: Individual
•
Filing: 1959-01-23
•
Granted: 1961-01-31
•
Expires: 1979-01-23
Abstract
No abstract record available.
Inventors
- 👤 Dewey S Hester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:23
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2067921A
Cited
US1983545A
Cited
US2107475A
Cited
US2259431A
Cited
US2199738A
Cited
US2239826A
Cited
US2531120A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-31 | 1964-08-01 | 1965-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-31 | 1968-08-01 | 1969-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-31 | 1972-08-01 | 1973-01-31 | $7700.00 | Window Closed / Lapsed |