US3855128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid filter bypass valve
Assignee: Gould Inc
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Filing: 1973-04-13
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Granted: 1974-12-17
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Expires: 1993-04-13
Abstract
Abstract A fluid filter such as an oil filter for an automotive internal combustion engine. The filter includes an improved bypass valve which is formed by only one extra part cooperating with the conventional end cap on the filter element and the conventional screw plate used to mount the filter on the engine. The extra part is a single unitary valve element which forms a fluid seal around the inner periphery of the end cap, and which includes a resilient free end portion overlapping fluid passageways formed in a portion of the end cap which extends radially inwardly beyond the inner periphery of the filter element. The inherent resiliency of the valve element normally biases the free end portion of the valve element against the end cap to close the passageway, but an increase in the fluid pressure on the inlet side of the end cap flexes the free end portion of the valve element away from the end cap to open the passageway to permit fluid to flow therethrough and bypass the filter element.
Inventors
- 👤 G Shaltz
- 👤 C Vanloo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:50
CPC Classifications
B; B01; B01D; B01D27/00; B01D27/08; B01D27/10; B01D27/103; B01D27/106
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
256 words
A fluid filter comprising the combination of an annular filter element, fluid communication means operatively associated with said filter element and including inlet means for conducting fluid to one side of said filter element and outlet means for conducting fluid away from the opposite side of said filter element, an annular end cap attached to one end of said filter element and preventing the entry of fluid into said filter element through said one end thereof, said end cap forming a fluid passageway extending directly from said inlet means to said outlet means so as to bypass said filter element, a screw plate fastened adjacent said end cap and forming an inturned axial flange that is internally threaded for mounting the filter, said end cap forming an axial flange on the inner periphery thereof and telescoped over the inturned axial flange of said screw plate, and a single unitary valve element fitted Tightly between the telescoped axial flanges of said end cap and said screw plate to form a fluid seal between the inner periphery of said end cap and the flange of said screw plate, said valve element including a resilient free end portion overlapping said fluid passageway and normally biased against said end cap to close said passageway, said resilient end portion being free for flexing movement away from said end cap in response to a predetermined increase in the fluid pressure in said inlet means so as to open said fluid passageway to permit fluid to flow therethrough and bypass said filter element.
Claim 2
Dependent Claim
256 words
A fluid filter comprising the combination of an annular filter element, fluid communication means operatively associated with said filter element and including inlet means for conducting fluid to one side of said filter element and outlet means for conducting fluid away from the opposite side of said filter element, an annular end cap attached to one end of said filter element and preventing the entry of fluid into said filter element through said one end thereof, said end cap forming a fluid passageway extending directly from said inlet means to said outlet means so as to bypass said filter element, a screw plate fastened adjacent said end cap and forming an inturned axial flange that is internally threaded for mounting the filter, said end cap forming an axial flange on the inner periphery thereof and telescoped over the inturned axial flange of said screw plate, and a single unitary valve element fitted Tightly between the telescoped axial flanges of said end cap and said screw plate to form a fluid seal between the inner periphery of said end cap and the flange of said screw plate, said valve element including a resilient free end portion overlapping said fluid passageway and normally biased against said end cap to close said passageway, said resilient end portion being free for flexing movement away from said end cap in response to a predetermined increase in the fluid pressure in said inlet means so as to open said fluid passageway to permit fluid to flow therethrough and bypass said filter element.
Claim 3
Dependent Claim
43 words
A fluid filter as set forth in claim 1 wherein cooperating shoulders are formed on opposed telescoping surfaces of said valve element and said end cap to latch said valve element to said end cap when said surfaces are telescoped over each other.
Claim 4
Dependent Claim
37 words
A fluid filter as set forth in claim 1 which includes an anti-drain back valve between said inlet means and said end cap to prevent the flow of fluid out of the filter through said inlet means.
Claim 5
Dependent Claim
45 words
A fluid filter as set forth in claim 1 wherein said end cap extends radially inwardly beyond the inner periphery of said filter element, and said fluid passageway is formed by a plurality of holes in said radially inwardly extending portion of said end cap.
Claim 6
Dependent Claim
20 words
A fluid filter as set forth in claim 1 wherein said inlet means includes apertures formed in said screw plate.
References Cited (Backward Citations)
CA683247A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |