US3751178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump
Assignee: Warren Pumps LLC
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Filing: 1971-10-06
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Granted: 1973-08-07
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Expires: 1991-10-06
Abstract
Abstract A centrifugal pump having a screw-type suction inducer located in the inlet passage and having a dual-stage pumping section.
Inventors
- 👤 J Paugh
- 👤 T Pollari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:47
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/18; F04D29/22; F04D29/2205; F04D29/2211; F04D1/00; F04D1/06; F04D13/00; F04D13/02; F04D13/04; F04D17/00; F04D17/08; F04D17/10; F04D17/12; F04D17/127; F04D29/2261; F04D29/2277; F04D29/26; F04D29/28; F04D29/284; F04D29/286
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
121 words
A pump, cormprising: a. a housing, b. a shaft rotatably mounted in the housing, the housing having an inlet passage coaxial of the shaft and an outlet passage extending at a right angle to the axis of the shaft. c. a centrifugal rotor mounted on the shaft and formed to receive fluid from the inlet passage and introduce it into the outlet passage, and d. a suction inducer having a screw with Edges and mounted on the shaft and lying between the inlet passage and the centrifugal rotor in a shroud having a bore with a surface which is tapered with the small diameter directed toward the rotor, the edges of the screw lying close to the surface of the bore.
Claim 2
Dependent Claim
121 words
A pump, cormprising: a. a housing, b. a shaft rotatably mounted in the housing, the housing having an inlet passage coaxial of the shaft and an outlet passage extending at a right angle to the axis of the shaft. c. a centrifugal rotor mounted on the shaft and formed to receive fluid from the inlet passage and introduce it into the outlet passage, and d. a suction inducer having a screw with Edges and mounted on the shaft and lying between the inlet passage and the centrifugal rotor in a shroud having a bore with a surface which is tapered with the small diameter directed toward the rotor, the edges of the screw lying close to the surface of the bore.
Claim 3
Dependent Claim
145 words
A pump, comprising: a. a housing, b. a shaft rotatably mounted in the housing, the housing having an inlet passage coaxial of the shaft and an outlet passage extending at a right angle to the axis of the shaft, c. a centrifugal rotor mounted on the shaft and formed to receive fluid from the inlet passage and introduce it into the outlet passage, the rotor having a primary passage leading first axially and then radially of the shaft, wherein a ring is mounted in the housing and has a reversing passage which leads from the primary passage radially inwardly to adjacent the shaft, and wherein the rotor has a secondary passage that leads first axially and then radially from the reversing passage to the outlet passage, and d. a suction inducer mounted on the shaft and lying between the inlet passage and the centrifugal rotor.
Claim 4
Dependent Claim
145 words
A pump, comprising: a. a housing, b. a shaft rotatably mounted in the housing, the housing having an inlet passage coaxial of the shaft and an outlet passage extending at a right angle to the axis of the shaft, c. a centrifugal rotor mounted on the shaft and formed to receive fluid from the inlet passage and introduce it into the outlet passage, the rotor having a primary passage leading first axially and then radially of the shaft, wherein a ring is mounted in the housing and has a reversing passage which leads from the primary passage radially inwardly to adjacent the shaft, and wherein the rotor has a secondary passage that leads first axially and then radially from the reversing passage to the outlet passage, and d. a suction inducer mounted on the shaft and lying between the inlet passage and the centrifugal rotor.
Claim 5
Dependent Claim
116 words
A pump, comprising: a. a housing, b. a shaft rotatably mounted in the housing, the housing having an inlet passage coaxial of the shaft and an outlet passage extending at a right angle to the axis of the shaft, c. a centrifugal rotor mounted on the shaft and formed to receive fluid from the inlet passage and introduce it into the outlet passage, and d. a suction inducer mounted on the shaft and lying between the inlet passage and the centrifugal rotor, and is provided with a screw having a pitch which varies from a small pitch at the end directed toward the inlet passage and a large pitch at the end directed toward the rotor.
Claim 6
Dependent Claim
116 words
A pump, comprising: a. a housing, b. a shaft rotatably mounted in the housing, the housing having an inlet passage coaxial of the shaft and an outlet passage extending at a right angle to the axis of the shaft, c. a centrifugal rotor mounted on the shaft and formed to receive fluid from the inlet passage and introduce it into the outlet passage, and d. a suction inducer mounted on the shaft and lying between the inlet passage and the centrifugal rotor, and is provided with a screw having a pitch which varies from a small pitch at the end directed toward the inlet passage and a large pitch at the end directed toward the rotor.
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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |