Patent US3873231A successfully refreshed from Google Patents.
US3873231A
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US
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Centrifugal pump diffuser
Assignee: Allis Chalmers Pump Inc
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Filing: 1973-09-13
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Granted: 1975-03-25
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Expires: 1993-09-13
Abstract
Abstract A rotary pump having a plurality of impeller blades and a plurality of circumferentially spaced vanes located about the periphery of said blades. The blades and vanes cause the fluid being acted upon by the pump to be delivered in pressure pulses of relatively high frequency and low magnitude. The spacing between adjacent vanes is nonuniform to prohibit uniform pressure patterns in the process fluid.
Inventors
- 👤 Thomas R Callahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:29
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/42; F04D29/44; F04D29/445; F04D29/448; D; D21; D21F; D21F1/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
100 words
A rotary fluid pump comprising; walls defining a pumping chamber; an impeller rotatably contained within said pumping chamber and having a plurality of substantially radially disposed circularly spaced blades; and a plurality of substantially radially disposed circularly spaced vanes located about the periphery of said blades and fixed to said walls the circular distances between points on adjacent vanes defined by the intersection thereof by a pair gradually spaced circles having as their centers the axis of the pump impeller being equal at the outer ends of said vanes and being unequal at the inner ends of said adjacent vanes.
Claim 2
Dependent Claim
100 words
A rotary fluid pump comprising; walls defining a pumping chamber; an impeller rotatably contained within said pumping chamber and having a plurality of substantially radially disposed circularly spaced blades; and a plurality of substantially radially disposed circularly spaced vanes located about the periphery of said blades and fixed to said walls the circular distances between points on adjacent vanes defined by the intersection thereof by a pair gradually spaced circles having as their centers the axis of the pump impeller being equal at the outer ends of said vanes and being unequal at the inner ends of said adjacent vanes.
Claim 3
Dependent Claim
28 words
The rotary pump set forth in claim 1 wherein the radial distance between the outer ends of said blades and the inner ends of said vanes are equal.
Claim 4
Dependent Claim
35 words
The rotary fluid pump set forth in claim 1 wherein the inner ends of alternate vanes are spaced a greater distance from the outer ends of said blades than the inner ends of adjacent vanes.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |