US2750894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal pump
Assignee: Waterous Co
•
Filing: 1951-03-16
•
Granted: 1956-06-19
•
Expires: 1971-03-16
Abstract
No abstract record available.
Inventors
- 👤 David F Thomas
- 👤 George A Rathburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:26
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/08; F04D29/10; F04D29/106; F04D29/108; F04D29/06; F04D29/061
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2244450A
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US2257011A
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US2331641A
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US2332150A
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US2505868A
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US2632395A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-19 | 1959-12-19 | 1960-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-19 | 1963-12-19 | 1964-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-19 | 1967-12-19 | 1968-06-19 | $7700.00 | Window Closed / Lapsed |