US2809013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for maintaining constant weight on a well tool
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1952-01-29
•
Granted: 1957-10-08
•
Expires: 1972-01-29
Abstract
No abstract record available.
Inventors
- 👤 Jr Leroy W Ledgerwood
- 👤 Fredric H Deily
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:11
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1660033A
Cited
US1891328A
Cited
US2317021A
Cited
US2586015A
Cited
US2341832A
Cited
GB545271A
Cited
US2549198A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |