US2900918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically operated transfer valve for centrifugal pump
Assignee: Waterous Co
•
Filing: 1956-06-04
•
Granted: 1959-08-25
•
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 06:49
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
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
NL2922C
Cited
US828547A
Cited
US916831A
Cited
US1049894A
Cited
US1137401A
Cited
US1898242A
Cited
CH116423A
Cited
US1864653A
Cited
US2391811A
Cited
US2668267A
Cited
US2660956A
Cited
US2780998A
Cited
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 |