Patent US3802807A successfully refreshed from Google Patents.
US3802807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump
Assignee: HELLER FINANCIAL Inc A DE CORP
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Filing: 1972-06-02
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Granted: 1974-04-09
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Expires: 1992-06-02
Abstract
Abstract A diaphragm pump having an enclosed sealed pumping compartment and a pair of one-way pumping valve elements providing a valve chamber therebetween. A pumping liquid passageway is provided communicating between the valve chamber and the uppermost portion of the pumping compartment sloping in an upward direction to the valve chamber for gravity retention of liquid in the compartment and the passageway. A flushing liquid passageway is provided communicating into the lower portion of the pumping compartment. The pumping compartment is free of other liquid communication for preventing introduction of air into the pumping compartment and the passageway especially while the pump is stopped.
Inventors
- 👤 E Kilayko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:07
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/14; F04B53/141; F04B43/00; F04B43/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
149 words
A diaphragm pump having an enclosed sealed pumping compartment with an uppermost edge portion pumping valve means including a pair of one-way valve elements providing a valve chamber therebetween said one-way valve elements being vertically spaced from one another and arranged for upward flow of liquid through said valve chamber pumping liquid passageway means communicating between said valve chamber and only said uppermost edge portion of said pumping compartment, sloping in an upward direction from said uppermost edge portion to said valve chamber, for gravity retention of liquid in said pumping compartment and passageway means flushing liquid passageway means communicating into the lower portion of said pumping compartment flushing valve means connected to said flushing liquid passageway means, and timing means operably connected to said flushing valve means, said pumping means being free of other liquid communication for preventing introduction of air into said pumping compartment and passageway meanS.
Claim 2
Dependent Claim
149 words
A diaphragm pump having an enclosed sealed pumping compartment with an uppermost edge portion pumping valve means including a pair of one-way valve elements providing a valve chamber therebetween said one-way valve elements being vertically spaced from one another and arranged for upward flow of liquid through said valve chamber pumping liquid passageway means communicating between said valve chamber and only said uppermost edge portion of said pumping compartment, sloping in an upward direction from said uppermost edge portion to said valve chamber, for gravity retention of liquid in said pumping compartment and passageway means flushing liquid passageway means communicating into the lower portion of said pumping compartment flushing valve means connected to said flushing liquid passageway means, and timing means operably connected to said flushing valve means, said pumping means being free of other liquid communication for preventing introduction of air into said pumping compartment and passageway meanS.
Claim 3
Dependent Claim
169 words
A diaphragm pump having a movable diaphragm and a pump housing defining a pumping compartment with an uppermost edge portion, pumping valve means including a pair of one-way valve elements providing a valve chamber therebetween said one-way valve elements being vertically spaced from one another and arranged for upward flow of liquid through said valve chamber pumping liquid passageway means communicating between said valve chamber and only said uppermost edge portion of said pumping compartment sloping in an upward direction from said uppermost edge portion to said valve chamber, for gravity retention of liquid in said pumping compartment and passageway means flushing liquid passageway means providing communication between the lower portion of said pumping compartment and the exterior of said pump housing, and flushing valve means located exterior to said pump housing and connected to said flushing liquid passageway means and to an external source of flushing liquid said pumping means being free of other liquid communication for preventing introduction of air into said pumping compartment and passageway means.
Claim 4
Dependent Claim
169 words
A diaphragm pump having a movable diaphragm and a pump housing defining a pumping compartment with an uppermost edge portion, pumping valve means including a pair of one-way valve elements providing a valve chamber therebetween said one-way valve elements being vertically spaced from one another and arranged for upward flow of liquid through said valve chamber pumping liquid passageway means communicating between said valve chamber and only said uppermost edge portion of said pumping compartment sloping in an upward direction from said uppermost edge portion to said valve chamber, for gravity retention of liquid in said pumping compartment and passageway means flushing liquid passageway means providing communication between the lower portion of said pumping compartment and the exterior of said pump housing, and flushing valve means located exterior to said pump housing and connected to said flushing liquid passageway means and to an external source of flushing liquid said pumping means being free of other liquid communication for preventing introduction of air into said pumping compartment and passageway means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-08 | 1977-10-08 | 1978-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-08 | 1981-10-08 | 1982-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-08 | 1985-10-08 | 1986-04-09 | $7700.00 | Window Closed / Lapsed |