US2672823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary pump
Assignee: Waterous Co
•
Filing: 1948-01-12
•
Granted: 1954-03-23
•
Expires: 1968-01-12
Abstract
No abstract record available.
Inventors
- 👤 Leroy A Thomson
- 👤 David F Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:01
CPC Classifications
F; F04; F04C; F04C15/00; F04C15/0003; F04C15/0034; F04C15/0038; F04C2/00; F04C2/08; F04C2/12; F04C2/126
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1891612A
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US1902347A
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US1877688A
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US2096490A
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US2193273A
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US2247454A
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US2269200A
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US2228933A
Cited
US2279136A
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US2372816A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-22 | 1957-09-21 | 1958-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-22 | 1961-09-21 | 1962-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-22 | 1965-09-21 | 1966-03-23 | $7700.00 | Window Closed / Lapsed |