Patent US2565951A successfully refreshed from Google Patents.
US2565951A
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US
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Drilling rate recorder
Assignee: Standard Oil Development Co
•
Filing: 1948-02-25
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Granted: 1951-08-28
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Expires: 1968-02-25
Abstract
No abstract record available.
Inventors
- 👤 Robert R Crookston
- 👤 James S Waters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:31
CPC Classifications
E; E21; E21B; E21B45/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1569062A
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US2357520A
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US2322478A
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US2357051A
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US2365014A
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US2390178A
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US2470567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-27 | 1955-02-26 | 1955-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-27 | 1959-02-26 | 1959-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-27 | 1963-02-26 | 1963-08-28 | $7700.00 | Window Closed / Lapsed |