US2680412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable volume variable pressure pump
Assignee: Individual
•
Filing: 1950-08-08
•
Granted: 1954-06-08
•
Expires: 1970-08-08
Abstract
No abstract record available.
Inventors
- 👤 John E Entwistle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:51
CPC Classifications
F; F04; F04B; F04B1/00; F04B1/04; F04B1/0404; F04B1/0408; F04B49/00; F04B49/12; F04B49/123; F04B49/128; F04B1/06; F04B1/07; F04B1/10; F04B1/113; F04B1/1133
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1149728A
Cited
US1227164A
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US1283249A
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US1612888A
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US2115121A
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US2166423A
Cited
GB490927A
Cited
US2233551A
Cited
US2292181A
Cited
US2336996A
Cited
US2485033A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-07 | 1957-12-07 | 1958-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-07 | 1961-12-07 | 1962-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-07 | 1965-12-07 | 1966-06-08 | $7700.00 | Window Closed / Lapsed |