Patent US2550004A successfully refreshed from Google Patents.
US2550004A
Expired / Lapsed
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Method of establishing markers in boreholes
Assignee: Schlumberger Well Surveying Corp
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Filing: 1943-12-22
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Granted: 1951-04-24
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Expires: 1963-12-22
Abstract
No abstract record available.
Inventors
- 👤 Doll Henri-Georges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:40
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/04; E21B47/053
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2165013A
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US2141826A
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US2085664A
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US2297754A
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US2259904A
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US2183565A
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US2273363A
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US2228623A
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US2371658A
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US2322797A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-23 | 1954-10-23 | 1955-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-23 | 1958-10-23 | 1959-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-23 | 1962-10-23 | 1963-04-24 | $7700.00 | Window Closed / Lapsed |