Patent US246959A successfully refreshed from Google Patents.
Patent US2965176A successfully refreshed from Google Patents.
US2965176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Formation testers
Assignee: Schlumberger Well Surveying Corp
•
Filing: 1958-03-05
•
Granted: 1960-12-20
•
Expires: 1978-03-05
Abstract
No abstract record available.
Inventors
- 👤 Emmet F Brieger
- 👤 Roger Q Fields
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:19
CPC Classifications
E; E21; E21B; E21B49/00; E21B49/08; E21B49/10
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2303727A
Cited
US2688369A
Cited
US2780292A
Cited
US2674313A
Cited
US2626777A
Cited
US2612346A
Cited
US2821256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-20 | 1964-06-20 | 1964-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-20 | 1968-06-20 | 1968-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-20 | 1972-06-20 | 1972-12-20 | $7700.00 | Window Closed / Lapsed |