Patent US4605564A successfully refreshed from Google Patents.
Patent US3671137A successfully refreshed from Google Patents.
US3671137A
Expired / Lapsed
US
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Centrifugal pump with hydrostatic bearing
Assignee: BW IP International Inc
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Filing: 1970-06-22
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Granted: 1972-06-20
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Expires: 1990-06-22
Abstract
Abstract A VERTICAL SHAFT, CENTRIFUGAL PUMP HAS A STEADY BEARING IN THE FORM OF A RADIAL HYDROSTATIC BEARING THAT JOURNALS THE SHAFT, THE HYDROSTATIC BEARING BEING ENERGIZED BY LIQUID CIRCULATED TO IT FROM THE DISCHARGE ZONE OF THE PUMP IMPELLER, THE CIRCULATION OF THE BEARING-ENERGIZING LIQUID BEING ACCOMPLISHED BY AN AUXILIARY CENTRIFUGAL IMPELLER DRIVEN BY THE SHAFT, THE AUXILLIARY IMPELLER-PREFERABLY BEING MOUNTED ON THE MAIN PUMP IMPELLER.
Inventors
- 👤 Rowland E Ball
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:40
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/04; F04D29/046; F04D29/047; F04D29/18; F04D29/22; F04D29/2261; F04D29/2266; F16; F16C; F16C32/00; F16C32/06; F16C32/0629; F16C32/064
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |