US2471939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pumping mechanism
Assignee: Individual
•
Filing: 1944-08-18
•
Granted: 1949-05-31
•
Expires: 1964-08-18
Abstract
No abstract record available.
Inventors
- 👤 Douglas P Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:08
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/22; F04B49/24; F04B1/00; F04B1/04; F04B1/06; F04B1/07; F04B49/12; F04B49/123; F04B49/125
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1040057A
Cited
US1149728A
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US1630168A
Cited
US1477300A
Cited
US1633720A
Cited
US1982958A
Cited
US2203646A
Cited
US2268695A
Cited
US2406115A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-30 | 1952-11-29 | 1953-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-30 | 1956-11-29 | 1957-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-30 | 1960-11-29 | 1961-05-31 | $7700.00 | Window Closed / Lapsed |