US2996807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earth bore survey instrument
Assignee: Eastman Oil Well Survey Co
•
Filing: 1956-08-08
•
Granted: 1961-08-22
•
Expires: 1976-08-08
Abstract
No abstract record available.
Inventors
- 👤 Orion F Fletcher
- 👤 Allan R Maclagan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:43
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/02; E21B47/022; E21B47/0236
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US604733A
Cited
GB245698A
Cited
US1959141A
Cited
US1910720A
Cited
US1895000A
Cited
US2103235A
Cited
US2296996A
Cited
US2414702A
Cited
US2432613A
Cited
US2413005A
Cited
US2332777A
Cited
US2598520A
Cited
US2566875A
Cited
US2581823A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |