Patent US2684835A successfully refreshed from Google Patents.
US2684835A
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US
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Apparatus for drilling well boreholes
Assignee: Standard Oil Development Co
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Filing: 1950-07-26
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Granted: 1954-07-27
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Expires: 1970-07-26
Abstract
No abstract record available.
Inventors
- 👤 Thomas V Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:56
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/07; E21B21/00; E21B44/00; E21B44/005; E21B7/00; E21B7/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1357564A
Cited
US1660033A
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US1686945A
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US1900932A
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US1767350A
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US1844257A
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US1905497A
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US2300805A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-26 | 1958-01-25 | 1958-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-26 | 1962-01-25 | 1962-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-26 | 1966-01-25 | 1966-07-27 | $7700.00 | Window Closed / Lapsed |