US2498159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Whipstock
Assignee: Eastman Oil Well Survey Co
•
Filing: 1944-05-12
•
Granted: 1950-02-21
•
Expires: 1964-05-12
Abstract
No abstract record available.
Inventors
- 👤 Roy C Gammill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:34
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/04; E21B7/06; E21B7/061
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1970761A
Cited
US2131849A
Cited
US2327658A
Cited
US2334747A
Cited
US2298706A
Cited
US2331293A
Cited
US2301307A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-20 | 1953-08-22 | 1954-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-20 | 1957-08-22 | 1958-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-20 | 1961-08-22 | 1962-02-21 | $7700.00 | Window Closed / Lapsed |