US3296972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid operated multi-stage machine
Assignee: Weir Group PLC
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Filing: 1965-04-20
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Granted: 1967-01-10
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Expires: 1985-04-20
Abstract
No abstract record available.
Inventors
- 👤 Arkless George Frederick
- 👤 Anderson Harold Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:49
CPC Classifications
F; F03; F03B; F03B3/00; F04; F04D; F04D1/00; F04D1/06; F04D1/063; F04D17/00; F04D17/08; F04D17/10; F04D17/12; F04D29/00; F04D29/40; F04D29/42; F04D29/44; F04D29/445; Y; Y02; Y02E; Y02E10/00; Y02E10/20; Y10; Y10S; Y10S415/00; Y10S415/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
A FLUID OPERATED MULTI-STAGE MACHINE INCLUDING A ROTATABLE SHAFT, A CASING, A FLUID IMPELLER WITHIN SAID CASING AND ROTATABLE WITH SAID SHAFT, THE IMPELLER HAVING VANES WHICH, TOGETHER WITH SHROUD PLATES DEFINE FLUID PASSES, A PLURALITY OF DIFFUSER PASSAGES IN THE CASING AND SPACED AROUND THE PERIPHERY OF THE IMPELLER VANES, EACH DIFFUSER PASSAGE COMMUNICATING AT ONE END WITH THE OUTER ENDS OF A NUMBER OF FLUID PASSAGES, AND THE VANES SERVING TO SEAL ADJACENT FLUID PASSAGES FROM ONE ANOTHER, A NUMBER OF RETURN PASSAGES BEING PROVIDED TO ENABLE FLUID COMMUNICATION BETWEEN THE OTHER END OF EACH DIFFUSER PASSAGE AND THE INNER ENDS OF THE FLUID PASSES WHICH ARE IN COMMUNICATION WITH THE NEXT SUCCESSIVE DIFFUSER PASSAGE, AND FLUID INLET AND OUTLET PASSAGES INTO AND OUT OF SAID CASING, SAID INLET PASSAGE COMMUNICATING WITH THE FLUID PASSES IN COMMUNICATION WITH THE FIRST STAGE DIFFUSER AND SAID OUTLET PASSAGE COMMUNICATING WITH THE DIFFUSER OF THE LAST STAGE WHEN THE MACHINE IS OPERATING AS A PUMP, THE IMPELLER BEING OVERHUNG FROM THE SHAFT
Claim 2
Dependent Claim
171 words
A FLUID OPERATED MULTI-STAGE MACHINE INCLUDING A ROTATABLE SHAFT, A CASING, A FLUID IMPELLER WITHIN SAID CASING AND ROTATABLE WITH SAID SHAFT, THE IMPELLER HAVING VANES WHICH, TOGETHER WITH SHROUD PLATES DEFINE FLUID PASSES, A PLURALITY OF DIFFUSER PASSAGES IN THE CASING AND SPACED AROUND THE PERIPHERY OF THE IMPELLER VANES, EACH DIFFUSER PASSAGE COMMUNICATING AT ONE END WITH THE OUTER ENDS OF A NUMBER OF FLUID PASSAGES, AND THE VANES SERVING TO SEAL ADJACENT FLUID PASSAGES FROM ONE ANOTHER, A NUMBER OF RETURN PASSAGES BEING PROVIDED TO ENABLE FLUID COMMUNICATION BETWEEN THE OTHER END OF EACH DIFFUSER PASSAGE AND THE INNER ENDS OF THE FLUID PASSES WHICH ARE IN COMMUNICATION WITH THE NEXT SUCCESSIVE DIFFUSER PASSAGE, AND FLUID INLET AND OUTLET PASSAGES INTO AND OUT OF SAID CASING, SAID INLET PASSAGE COMMUNICATING WITH THE FLUID PASSES IN COMMUNICATION WITH THE FIRST STAGE DIFFUSER AND SAID OUTLET PASSAGE COMMUNICATING WITH THE DIFFUSER OF THE LAST STAGE WHEN THE MACHINE IS OPERATING AS A PUMP, THE IMPELLER BEING OVERHUNG FROM THE SHAFT
References Cited (Backward Citations)
SE108042C1
Cited
US2120277A
Cited
GB537727A
Cited
AU128026B2
Cited
US2496496A
Cited
FR1141880A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-09 | 1970-07-11 | 1971-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-09 | 1974-07-11 | 1975-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-09 | 1978-07-11 | 1979-01-10 | $7700.00 | Window Closed / Lapsed |