US2476136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for locating predetermined levels in boreholes
Assignee: Schlumberger Well Surveying Corp
•
Filing: 1940-04-19
•
Granted: 1949-07-12
•
Expires: 1960-04-19
Abstract
No abstract record available.
Inventors
- 👤 Doll Henri-Georges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:49
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1928970A
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US2029490A
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US2037306A
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US2033562A
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US2167630A
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US2171840A
Cited
US2220205A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-11 | 1953-01-10 | 1953-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-11 | 1957-01-10 | 1957-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-11 | 1961-01-10 | 1961-07-12 | $7700.00 | Window Closed / Lapsed |