Patent CH56536A successfully refreshed from Google Patents.
US2547876A
Expired / Lapsed
US
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Apparatus for investigating a plurality of physical values in bore-holes
Assignee: Schlumberger Well Surveying Corp
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Filing: 1944-01-05
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Granted: 1951-04-03
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Expires: 1964-01-05
Abstract
No abstract record available.
Inventors
- 👤 Krasnow Shelley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:09
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/06; G; G01; G01V; G01V3/00; G01V3/18; G01V3/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US122437A
Cited
US1745714A
Cited
US1913511A
Cited
US1999215A
Cited
US1928971A
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US1991658A
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US2014518A
Cited
US2038046A
Cited
US2144215A
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US2018080A
Cited
US2317304A
Cited
US2225668A
Cited
US2425868A
Cited
US2421423A
Cited
US2190950A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-02 | 1954-10-02 | 1955-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-02 | 1958-10-02 | 1959-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-02 | 1962-10-02 | 1963-04-03 | $7700.00 | Window Closed / Lapsed |