Patent US4701407A successfully refreshed from Google Patents.
Patent US2964941A successfully refreshed from Google Patents.
US2964941A
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Method for determining production characteristics of pumping wells producing oil andbrine
Assignee: Pure Oil Co
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Filing: 1955-12-12
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Granted: 1960-12-20
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Expires: 1975-12-12
Abstract
No abstract record available.
Inventors
- 👤 Glenn A Marsh
- 👤 Henry L Chamberlain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:42
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/06; G01N27/08; E; E21; E21B; E21B43/00; E21B43/12; E21B43/121; E21B43/126; E21B43/127; E21B47/00; E21B47/007; E21B47/10; E21B47/113
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) | 1963-12-20 | 1964-06-20 | 1964-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-20 | 1968-06-20 | 1968-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-20 | 1972-06-20 | 1972-12-20 | $7700.00 | Window Closed / Lapsed |