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US2727467A
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US
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Sub-surface pumping units
Assignee: Individual
•
Filing: 1951-04-24
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Granted: 1955-12-20
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Expires: 1971-04-24
Abstract
No abstract record available.
Inventors
- 👤 Russell Carl Dexter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:35
CPC Classifications
F; F01; F01L; F01L23/00; F01L21/00; F01L21/04; F04; F04B; F04B9/00; F04B9/08; F04B9/10; F04B9/109; F04B9/111; F04B9/113
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) | 1958-12-19 | 1959-06-20 | 1959-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-19 | 1963-06-20 | 1963-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-19 | 1967-06-20 | 1967-12-20 | $7700.00 | Window Closed / Lapsed |