US3230890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal pump
Assignee: Individual
•
Filing: 1963-11-15
•
Granted: 1966-01-25
•
Expires: 1983-11-15
Abstract
No abstract record available.
Inventors
- 👤 Yokota Hidekuni
- 👤 Yokota Shingo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:24
CPC Classifications
F; F04; F04D; F04D9/00; F04D9/04; F04D9/041; F04D9/001; F04D9/002; F04D9/003; F05; F05B; F05B2210/00; F05B2210/10; F05B2210/13; F05B2210/132
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
215 words
A CENTRIFUGAL PUMP ASSEMBLAGE COMPRISING A MAIN PUMP HAVING A CASING, DRIVING SHAFT, A MAIN CENTRIFUGAL IMPELLER MOUNTED ON SAID SHAFT WITHIN THE CASING, A SUCTION INLET AND A DISCHARGE OUTLET COMMUNICATING WITH SAID CASING, AN AUXILIARY PUMP HAVING AN AUXILIARY CASING DISPOSED IN SIDE-BY-SIDE RELATIONSHIP TO THE MAIN PUMP CASING, A COMMON WALL BETWEEN SAID MAIN AND AUXILIARY CASINGS, AN AUXILIARY CENTRIFUGAL IMPELLER, SAID DRIVING SHAFT EXTENDING THROUGH THE AUXILIARY PUMP CASING AND THROUGH SAID COMMON WALL, SAID AUXILIARY IMPELLER BEING MOUNTED ON SAID SHAFT WITHIN SAID AUXILIARY PUMP CASING, SAID COMMON WALL HAVING A CENTRAL SUCTION INLET OPENING THEREIN PROVIDING COMMUNICATION BETWEEN SAID MAIN PUMP CASING AND SAID AUXILIARY PUMP CASING, MEANS ON SAID SHAFT SERVING TO RESTRICT THE CROSS SECTIONAL AREA OF SAID CENTRAL SUCTION INLET OPENING, A DISCHARGE OUTLET FROM SAID AUXILIARY CASING COMMUNICATING WITH THE SUCTION INLET OF THE MAIN PUMP CASING, WHEREBY DENSE FLUID IS DISCHARGED FROM SAID AUXILIARY PUMP CASING TO THE SUCTION INLET OF SAID MAIN PUMP CASING, AND A VACUUM PUMP HAVING A SUCTION INLET IN COMMUNICATION WITH SAID AUXILIARY PUMP CASING, WHEREBY GASEOUS MEDIUM IS WITHDRAWN FROM SAID AUXILIARY PUMP CASING, THE PUMPING CAPACITY OF THE VACUUM PUMP BEING SUCH THAT THE VACUUM DEVELOPED THEREBY IS OVERCOME BY THE PUMPING ACTION OF THE AUXILIARY PUMP.
Claim 2
Dependent Claim
215 words
A CENTRIFUGAL PUMP ASSEMBLAGE COMPRISING A MAIN PUMP HAVING A CASING, DRIVING SHAFT, A MAIN CENTRIFUGAL IMPELLER MOUNTED ON SAID SHAFT WITHIN THE CASING, A SUCTION INLET AND A DISCHARGE OUTLET COMMUNICATING WITH SAID CASING, AN AUXILIARY PUMP HAVING AN AUXILIARY CASING DISPOSED IN SIDE-BY-SIDE RELATIONSHIP TO THE MAIN PUMP CASING, A COMMON WALL BETWEEN SAID MAIN AND AUXILIARY CASINGS, AN AUXILIARY CENTRIFUGAL IMPELLER, SAID DRIVING SHAFT EXTENDING THROUGH THE AUXILIARY PUMP CASING AND THROUGH SAID COMMON WALL, SAID AUXILIARY IMPELLER BEING MOUNTED ON SAID SHAFT WITHIN SAID AUXILIARY PUMP CASING, SAID COMMON WALL HAVING A CENTRAL SUCTION INLET OPENING THEREIN PROVIDING COMMUNICATION BETWEEN SAID MAIN PUMP CASING AND SAID AUXILIARY PUMP CASING, MEANS ON SAID SHAFT SERVING TO RESTRICT THE CROSS SECTIONAL AREA OF SAID CENTRAL SUCTION INLET OPENING, A DISCHARGE OUTLET FROM SAID AUXILIARY CASING COMMUNICATING WITH THE SUCTION INLET OF THE MAIN PUMP CASING, WHEREBY DENSE FLUID IS DISCHARGED FROM SAID AUXILIARY PUMP CASING TO THE SUCTION INLET OF SAID MAIN PUMP CASING, AND A VACUUM PUMP HAVING A SUCTION INLET IN COMMUNICATION WITH SAID AUXILIARY PUMP CASING, WHEREBY GASEOUS MEDIUM IS WITHDRAWN FROM SAID AUXILIARY PUMP CASING, THE PUMPING CAPACITY OF THE VACUUM PUMP BEING SUCH THAT THE VACUUM DEVELOPED THEREBY IS OVERCOME BY THE PUMPING ACTION OF THE AUXILIARY PUMP.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |