Patent US2674877A successfully refreshed from Google Patents.
US2674877A
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Well productivity measurement
Assignee: Stanolind Oil and Gas Co
•
Filing: 1950-07-01
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Granted: 1954-04-13
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Expires: 1970-07-01
Abstract
No abstract record available.
Inventors
- 👤 Silverman Daniel
- 👤 Ralph E Hartline
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:43
CPC Classifications
E; E21; E21B; E21B49/00; E21B49/08; E21B49/087; E21B47/00; E21B47/10; E21B47/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2202404A
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US2348192A
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US2333164A
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US2300206A
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US2450265A
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US2413435A
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US2517603A
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US2524933A
Cited
US2473713A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-12 | 1957-10-12 | 1958-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-12 | 1961-10-12 | 1962-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-12 | 1965-10-12 | 1966-04-13 | $7700.00 | Window Closed / Lapsed |