Patent US723643A successfully refreshed from Google Patents.
Patent US2900918A successfully refreshed from Google Patents.
US2900918A
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Electrically operated transfer valve for centrifugal pump
Assignee: Waterous Co
•
Filing: 1956-06-04
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Granted: 1959-08-25
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Expires: 1976-06-04
Abstract
No abstract record available.
Inventors
- 👤 David F Thomas
- 👤 Robert A Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:06
CPC Classifications
F; F04; F04D; F04D1/00; F04D1/06; F04D1/10; A; A62; A62C; A62C31/00; A62C31/28; Y; Y10; Y10T; Y10T137/00; Y10T137/8158; Y10T137/8225; Y10T137/8242
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1898242A
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US2391811A
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US2668267A
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US2660956A
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US2780998A
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US2738033A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |