Patent US2637998A successfully refreshed from Google Patents.
US2637998A
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Apparatus for determining well pressures
Assignee: Atlantic Richfield Co
•
Filing: 1946-11-14
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Granted: 1953-05-12
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Expires: 1966-11-14
Abstract
No abstract record available.
Inventors
- 👤 John H Ramser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:26
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1887739A
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US1837222A
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US2025461A
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US2112682A
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US2225668A
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US2421423A
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US2155419A
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US2455021A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |