Patent US2611436A successfully refreshed from Google Patents.
US2611436A
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Apparatus for injecting fluids into well bores
Assignee: Pure Oil Co
•
Filing: 1948-04-26
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Granted: 1952-09-23
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Expires: 1968-04-26
Abstract
No abstract record available.
Inventors
- 👤 Richard H Carr
- 👤 Kenneth A Covell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:26
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/127; E21B33/1277; E21B33/124; E21B33/1243; E21B43/00; E21B43/16; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/2937; Y10T137/2947; Y10T137/2965; Y10T137/2968
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1547240A
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US1861332A
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US2053981A
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US2019418A
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US2133730A
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US2107006A
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US2217749A
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US2399125A
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US2361194A
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US2365428A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-23 | 1956-03-24 | 1956-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-23 | 1960-03-24 | 1960-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-23 | 1964-03-24 | 1964-09-23 | $7700.00 | Window Closed / Lapsed |