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US2600173A
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Formation tester
Assignee: Standard Oil Development Co
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Filing: 1949-10-26
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Granted: 1952-06-10
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Expires: 1969-10-26
Abstract
No abstract record available.
Inventors
- 👤 Ben W Sewell
- 👤 George H Ramsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:31
CPC Classifications
E; E21; E21B; E21B49/00; E21B49/08; E21B49/084; E21B33/00; E21B33/10; E21B33/12; E21B33/127; E21B33/1277
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-06-10 | 1955-12-10 | 1956-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-10 | 1959-12-10 | 1960-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-10 | 1963-12-10 | 1964-06-10 | $7700.00 | Window Closed / Lapsed |