US3811571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump filters
Assignee: Standard Hydraulics Service Inc
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Filing: 1972-07-03
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Granted: 1974-05-21
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Expires: 1992-07-03
Abstract
Abstract A pump filter comprises a housing having two independent chambers in communication with each other. The chambers are vertically spaced with the upper chamber being further defined by a mounting plate and the lower chamber communicating with a suction tube. A filter screen is positioned in the upper chamber and the lower chamber includes a swing valve which opens and closes the mouth of the suction tube. A removable plug communicates with the second chamber to permit access thereto.
Inventors
- 👤 J Woods
- 👤 G Kerns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:39
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/02; B01D35/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
136 words
A pump filter for use on mine equipment hydraulic systems and the like comprising a vertically extending housing terminating at an upper end in a mounting plate adapted for securement to a pump, said housing including a first chamber exiting through the mounting plate to communicate with the pump and a second chamber positioned below the first chamber and communicating therewith, an elongated suction tube depending from the housing and having a mouth in communication with the second chamber, a swing valve pivotally connected at a lower portion of the second chamber and adapted to swing from a valve seat formed by the suction tube to open and close said mouth, filter means positioned within the first chamber and removable plug means communicating with the second chamber substantially adjacent the valve seat to permit access thereto.
Claim 2
Dependent Claim
136 words
A pump filter for use on mine equipment hydraulic systems and the like comprising a vertically extending housing terminating at an upper end in a mounting plate adapted for securement to a pump, said housing including a first chamber exiting through the mounting plate to communicate with the pump and a second chamber positioned below the first chamber and communicating therewith, an elongated suction tube depending from the housing and having a mouth in communication with the second chamber, a swing valve pivotally connected at a lower portion of the second chamber and adapted to swing from a valve seat formed by the suction tube to open and close said mouth, filter means positioned within the first chamber and removable plug means communicating with the second chamber substantially adjacent the valve seat to permit access thereto.
Claim 3
Dependent Claim
25 words
The pump filter of claim 1 wherein an annular shoulder separates the first and second chambers, said annular shoulder defining a passageway between said chambers.
Claim 4
Dependent Claim
16 words
The pump filter of claim 1 wherein the first chamber is frusto dome or flat shaped.
Claim 5
Dependent Claim
28 words
The pump filter of claim 1 wherein the filter means includes a screen positioned on said shoulder and extending upward in the first chamber in substantial conformity therewith.
Claim 6
Dependent Claim
30 words
The pump filter of claim 1 wherein a stop block is mounted within the second chamber to an internal surface thereof to limit the upward movement of the swing valve.
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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |