Patent US3671138A successfully refreshed from Google Patents.
US3671138A
Expired / Lapsed
US
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Composite knockdown pump
Assignee: Borg Warner Corp
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Filing: 1971-02-02
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Granted: 1972-06-20
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Expires: 1991-02-02
Abstract
Abstract A CENTRIFUGAL FLUID PUMP SUITABLE FOR ASSEMBLY INTO AN OPERABLE UNIT WITHIN A CONFINED SPACE INCLUDING A PLURALITY OF IMPELLERS EACH MOUNTED WITHIN RESPECTIVE FLUID DISCHARGE MEMBERS AND IN RESPECTIVE ASSOCIATION WITH A PLURALITY OF FLUID SUCTION INLET MEMBERS, SUCH IMPELLERS BEING MOUNTED ON A COMPOSITE DRIVE SHAFT HAVING A PLURALITY OF MEMBERS INTEGRALLY ASSEMBLED TO PROVIDE A HIGH DEGREE OF RADIAL AND AXIAL ALIGNMENT AND A HIGH TORQUE TRANSFER CAPABILITY.
Inventors
- 👤 Rowland E Ball
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:11
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/04; F04D29/043; F04D29/044; F04D1/00; F04D1/006; F04D1/06; F04D1/063; F04D29/40; F04D29/42; F04D29/44; F04D29/445; F04D29/60; F04D29/62; F04D29/628; F04D29/66; F04D29/68; F04D29/688
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 |