Patent US2940177A successfully refreshed from Google Patents.
US2940177A
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Apparatus for exploring boreholes
Assignee: Schlumberger Well Surveying Corp
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Filing: 1956-02-02
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Granted: 1960-06-14
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Expires: 1976-02-02
Abstract
No abstract record available.
Inventors
- 👤 Joseph M Bricaud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:32
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/02; E21B47/022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1375278A
Cited
US1928969A
Cited
GB422701A
Cited
US2338811A
Cited
US2309905A
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US2640275A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |