Patent US2442240A successfully refreshed from Google Patents.
Patent US3824041A successfully refreshed from Google Patents.
US3824041A
Expired / Lapsed
US
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Positive displacement liquid pump
Assignee: Individual
•
Filing: 1972-08-01
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Granted: 1974-07-16
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Expires: 1992-08-01
Abstract
Abstract A positive displacement pump has a passageway connected between the outlet side of the pump and an intermediate location in the pumping mechanism for supplying liquid under pressure thereto for reducing cavitation in the pump.
Inventors
- 👤 C Rystrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:18
CPC Classifications
F; F04; F04C; F04C15/00; F04C15/06; F04C15/062
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
141 words
A positive displacement liquid pump, comprising a housing having a pumping chamber therein, an inlet to one side of said chamber and an outlet from the other side of said chamber, motor driven pumping means mounted in said chamber between said inlet and said outlet, a supercharging passageway extending through said housing between the outlet side of said chamber and a location in said chamber intermediate said inlet and said outlet, a restricted metering means of fixed cross-sectional area disposed in said passageway to provide a constant rate of flow through said passageway for any given pump speed, and pressure relief means connected downstream of said restricted metering means and between said restricted metering means and said inlet to regulate the pressure of the liquid in the passageway between said restricted metering means and said intermediate location in said meteriNg chamber.
Claim 2
Dependent Claim
141 words
A positive displacement liquid pump, comprising a housing having a pumping chamber therein, an inlet to one side of said chamber and an outlet from the other side of said chamber, motor driven pumping means mounted in said chamber between said inlet and said outlet, a supercharging passageway extending through said housing between the outlet side of said chamber and a location in said chamber intermediate said inlet and said outlet, a restricted metering means of fixed cross-sectional area disposed in said passageway to provide a constant rate of flow through said passageway for any given pump speed, and pressure relief means connected downstream of said restricted metering means and between said restricted metering means and said inlet to regulate the pressure of the liquid in the passageway between said restricted metering means and said intermediate location in said meteriNg chamber.
Claim 3
Dependent Claim
19 words
A positive displacement liquid pump according to claim 1 wherein said pumping means is a pair of intermeshing gears.
Claim 4
Dependent Claim
37 words
A pump according to claim 1 for use with an oil burner, wherein said metering means has a flow rate of about 2 to 3 gallons per hour at a pump discharge pressure of about 100 p.s.i.
References Cited (Backward Citations)
CH157744A
Cited
DE865864C
Cited
US2544144A
Cited
US2665057A
Cited
US2774309A
Cited
GB868544A
Cited
GB967944A
Cited
US3635604A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |