Patent US2644531A successfully refreshed from Google Patents.
US2644531A
Expired / Lapsed
US
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Flowing unit for oil well controllers
Assignee: M L MORGAN
•
Filing: 1950-06-22
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Granted: 1953-07-07
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Expires: 1970-06-22
Abstract
No abstract record available.
Inventors
- 👤 Paul L Mclean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:08
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/24; E21B43/2401
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US495071A
Cited
US1309721A
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US1169261A
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US2268978A
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US2451989A
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US2500305A
Cited
US2530280A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |