Patent DE251571C successfully refreshed from Google Patents.
Patent US2175860A successfully refreshed from Google Patents.
US4147478A
Expired / Lapsed
US
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Secondary pump feed apparatus
Assignee: Graco Inc
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Filing: 1977-09-22
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Granted: 1979-04-03
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Expires: 1997-09-22
Abstract
Abstract Apparatus for connecting to a pump inlet where a first inlet feedpipe is attached including a second inlet feedpipe tap having a one-way check valve, and a resilient orifice member in the first inlet feedpipe upstream of the tap, whereby the orifice size is less than the inlet feedpipe size so as to provide a flow restriction for periodically creating negative pressure in the region of the tap, to draw liquid from the second inlet feedpipe into the first inlet feedpipe.
Inventors
- 👤 William D. Vork
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:14
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/02; B; B01; B01F; B01F25/00; B01F25/30; B01F25/31
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
126 words
An apparatus for connecting to a positive displacement pump for providing the metered introduction of a secondary liquid to the primary liquid delivered by the pump, comprising: (a) a housing for permitting primary liquid flow therethrough, said housing having an internal shoulder and a downstream passage of reduced diameter; (b) a resilient member seated on said shoulder, said resilient member having an orifice therethrough of lesser size than said housing downstream passage and further sized to restrict fluid flow therethrough to a lesser quantity than the peak pump flow delivery rate; and (c) a secondary inlet in said housing downstream of said resilient member, said secondary inlet having a one-way check valve therein to permit liquid flow toward said housing and to restrict reverse liquid flow.
Claim 2
Independent Claim
126 words
An apparatus for connecting to a positive displacement pump for providing the metered introduction of a secondary liquid to the primary liquid delivered by the pump, comprising: (a) a housing for permitting primary liquid flow therethrough, said housing having an internal shoulder and a downstream passage of reduced diameter; (b) a resilient member seated on said shoulder, said resilient member having an orifice therethrough of lesser size than said housing downstream passage and further sized to restrict fluid flow therethrough to a lesser quantity than the peak pump flow delivery rate; and (c) a secondary inlet in said housing downstream of said resilient member, said secondary inlet having a one-way check valve therein to permit liquid flow toward said housing and to restrict reverse liquid flow.
Claim 3
Dependent Claim
23 words
The apparatus of claim 1, wherein said secondary inlet further comprises means for spring biasing said one-way check valve toward a closed position.
Claim 4
Dependent Claim
19 words
The apparatus of claim 1, wherein said housing further comprises a threaded inlet for accepting a water supply hose.
Claim 5
Dependent Claim
20 words
The apparatus of claim 3, wherein said secondary inlet further comprises a threaded member for accepting a soap supply tube.
References Cited (Backward Citations)
US1277383A
Cited
US2266125A
Cited
US2604854A
Cited
US2819678A
Cited
US2632476A
Cited
US2971470A
Cited
US3042981A
Cited
US3205830A
Cited
US3601510A
Cited
DE2306406A1
Cited
DE2613702A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |