Patent US3073249A successfully refreshed from Google Patents.
US3073249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multistage self-suction type centrifugal pump
Assignee: Individual
•
Filing: 1958-02-14
•
Granted: 1963-01-15
•
Expires: 1978-02-14
Abstract
No abstract record available.
Inventors
- 👤 Yokota Hidekuni
- 👤 Yokota Shingo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:15
CPC Classifications
F; F04; F04D; F04D9/00; F04D9/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A MULTI-STAGE SELF-SUCTION TYPE CENTRIFUGAL PUMP COMPRISING A CASING HAVING A PAIR OF SPACED PARTITIONS THEREIN TO FORM THREE SUCCESSIVE CHAMBERS, SAID CASING HAVING AN INLET OPENING FOR THE FLUID INTO THE FIRST CHAMBER AND AN OUTLET OPENING FROM THE CASING FOR THE LIQUID FROM THE THIRD CHAMBER, A ROTATABLE SHAFT IN THE CASING EXTENDING THROUGH THE CHAMBERS, A FIRST SELF-PRIMING PUMP STAGE INCLUDING AN IMPELLER MOUNTED ON THE SHAFT WITHIN THE FIRST CHAMBER, THE FIRST PARTITION HAVING AN OPENING THEREIN ABOVE THE SHAFT FOR THE FLOW OF LIQUID AND AIR FROM THE FIRST CHAMBER TO THE SECOND CHAMBER, AND A SECOND OPENING IN THE FIRST PARTITION AT A LEVEL BELOW THE SHAFT BUT ABOVE THE BOTTOM OF THE CASING FOR THE RETURN OF LIQUID ONLY FROM THE SECOND CHAMBER TO THE FIRST CHAMBER FOR TRAPPING LIQUID THEREIN WHEREBY A SELF-PRIMING ACTION IS CARRIED OUT BY THE FIRST PUMP STAGE UPON THE
Claim 2
Dependent Claim
152 words
A MULTI-STAGE SELF-SUCTION TYPE CENTRIFUGAL PUMP COMPRISING A CASING HAVING A PAIR OF SPACED PARTITIONS THEREIN TO FORM THREE SUCCESSIVE CHAMBERS, SAID CASING HAVING AN INLET OPENING FOR THE FLUID INTO THE FIRST CHAMBER AND AN OUTLET OPENING FROM THE CASING FOR THE LIQUID FROM THE THIRD CHAMBER, A ROTATABLE SHAFT IN THE CASING EXTENDING THROUGH THE CHAMBERS, A FIRST SELF-PRIMING PUMP STAGE INCLUDING AN IMPELLER MOUNTED ON THE SHAFT WITHIN THE FIRST CHAMBER, THE FIRST PARTITION HAVING AN OPENING THEREIN ABOVE THE SHAFT FOR THE FLOW OF LIQUID AND AIR FROM THE FIRST CHAMBER TO THE SECOND CHAMBER, AND A SECOND OPENING IN THE FIRST PARTITION AT A LEVEL BELOW THE SHAFT BUT ABOVE THE BOTTOM OF THE CASING FOR THE RETURN OF LIQUID ONLY FROM THE SECOND CHAMBER TO THE FIRST CHAMBER FOR TRAPPING LIQUID THEREIN WHEREBY A SELF-PRIMING ACTION IS CARRIED OUT BY THE FIRST PUMP STAGE UPON THE
References Cited (Backward Citations)
NL48942C
Cited
US933247A
Cited
US1849217A
Cited
US1946212A
Cited
US2127865A
Cited
DE646436C
Cited
US2575923A
Cited
CH303395A
Cited
DE913572C
Cited
US2792192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-01-14 | 1966-07-16 | 1967-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-14 | 1970-07-16 | 1971-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-14 | 1974-07-16 | 1975-01-15 | $7700.00 | Window Closed / Lapsed |