US3586171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination dual-flow and two-stage filter
Assignee: Tenneco Inc
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Filing: 1969-05-09
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Granted: 1971-06-22
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Expires: 1989-05-09
Abstract
Abstract An oil filter for internal combustion engines has filter elements of two different flow rates arranged in parallel so that in general the high flow rate material acts as a full flow filter and filters oil going to the bearings and the low flow rate material acts as a bypass filter and filters oil that is returned to the crankcase. Automatic modification of this general dualflow arrangement and control of flow through the low flow rate material is provided by orifice means that connects the outlet sides of the two filter elements. This means includes a hole that is controlled by a one-way valve which prevents flow from the high-flow outlet side to the low-flow outlet side but permits it in the reverse direction and may also include an open bleed hole.
Inventors
- 👤 Robert J Offer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:27
CPC Classifications
B; B01; B01D; B01D27/00; B01D27/02; B01D27/04; B01D27/10; B01D27/108; B01D27/14; B01D27/142; B01D27/144; B01D2101/00; B01D2101/005
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
256 words
An oil filter for attachment to an oil filter base of an internal combustion engine, said base having a passage for incoming oil to be filtered and a passage for filtered oil to flow to the engine bearings and a passage including a tubular probe with a restricted opening for filtered oil to flow to the crankcase, said filter comprising a housing having oil inlet means, a high flow rate filter element in the housing arranged to receive oil from the inlet means, a low flow rate filter element in the housing arranged in parallel with the high-flow element to receive oil from the inlet means, first means defining an outlet chamber for oil passed through the high flow rate element, second means defining an outlet chamber for oil passed through the low flow rate element, hole means interconnecting said two Outlet chambers to provide for flow from the chamber at higher pressure to the chamber at lower pressure, first outlet means for connecting said high flow rate outlet chamber to the passage in the base for filtered oil to flow to the bearings, and second outlet means for connecting the low flow outlet chamber to the probe for filtered oil to flow to the crankcase, said low flow rate filter element having an optimum maximum velocity of oil flow through it, the total area of said hole means and said probe restricted opening being such that the velocity of oil flow through said low flow rate element does not substantially exceed said optimum maximum velocity.
Claim 2
Dependent Claim
256 words
An oil filter for attachment to an oil filter base of an internal combustion engine, said base having a passage for incoming oil to be filtered and a passage for filtered oil to flow to the engine bearings and a passage including a tubular probe with a restricted opening for filtered oil to flow to the crankcase, said filter comprising a housing having oil inlet means, a high flow rate filter element in the housing arranged to receive oil from the inlet means, a low flow rate filter element in the housing arranged in parallel with the high-flow element to receive oil from the inlet means, first means defining an outlet chamber for oil passed through the high flow rate element, second means defining an outlet chamber for oil passed through the low flow rate element, hole means interconnecting said two Outlet chambers to provide for flow from the chamber at higher pressure to the chamber at lower pressure, first outlet means for connecting said high flow rate outlet chamber to the passage in the base for filtered oil to flow to the bearings, and second outlet means for connecting the low flow outlet chamber to the probe for filtered oil to flow to the crankcase, said low flow rate filter element having an optimum maximum velocity of oil flow through it, the total area of said hole means and said probe restricted opening being such that the velocity of oil flow through said low flow rate element does not substantially exceed said optimum maximum velocity.
Claim 3
Dependent Claim
42 words
A device as set forth in claim 1 wherein said hole means includes a check valve controlled opening providing for flow only from the second means to the first means, said opening being substantially larger in size than said probe restricted opening.
Claim 4
Dependent Claim
28 words
A device as set forth in claim 2 wherein said hole means includes a permanently open bleed hole which is substantially smaller in size than said probe-restricted opening.
Claim 5
Dependent Claim
198 words
In a liquid filter having a housing with an inlet and an outlet for liquid to enter and leave the filter, first and second filter elements mounted inside the housing and arranged in parallel with respect to liquid flow from said inlet to said outlet, means defining an outlet chamber for said first filter element which communicates with said filter outlet, means defining an outlet chamber for said second filter element including a wall separating it from the outlet chamber for the first filter element, a permanent opening in said wall connecting the two outlet chambers for liquid flow in either direction from one to the other, a check valve controlled opening in said wall providing for flow only from the second filter element outlet chamber to the first filter element outlet chamber but preventing flow in the reverse direction, said first filter element being relatively coarse and said second filter element being relatively fine in porosity, said second filter element having an optimum maximum velocity of liquid flow through it, the total area of said openings being such that the velocity of liquid flow through said second filter element does not substantially exceed said optimum maximum velocity.
Claim 6
Dependent Claim
198 words
In a liquid filter having a housing with an inlet and an outlet for liquid to enter and leave the filter, first and second filter elements mounted inside the housing and arranged in parallel with respect to liquid flow from said inlet to said outlet, means defining an outlet chamber for said first filter element which communicates with said filter outlet, means defining an outlet chamber for said second filter element including a wall separating it from the outlet chamber for the first filter element, a permanent opening in said wall connecting the two outlet chambers for liquid flow in either direction from one to the other, a check valve controlled opening in said wall providing for flow only from the second filter element outlet chamber to the first filter element outlet chamber but preventing flow in the reverse direction, said first filter element being relatively coarse and said second filter element being relatively fine in porosity, said second filter element having an optimum maximum velocity of liquid flow through it, the total area of said openings being such that the velocity of liquid flow through said second filter element does not substantially exceed said optimum maximum velocity.
Claim 7
Dependent Claim
208 words
An oil filter for attachment to an oil filter base of an internal combustion engine, said base having passages for incoming oil to be filtered and for filtered oil to flow to the engine bearings and to the crankcase, said filter comprising a housing having oil inlet means, a high flow rate filter element in the housing arranged to receive oil from the inlet means, a low flow rate filter element in the housing arranged in parallel with the high flow element to receive oil from the inlet means, first means defining an outlet chamber for oil passed through the high flow rate element, second means defining an outlet chamber for oil passed through the low flow rate element, hole means interconnecting said two outlet chambers to provide for flow from the chamber at higher pressure to the chamber at lower pressure, first outlet means for connecting said high flow rate outlet chamber to the passage in the base for filtered oil to flow to the bearings, said second outlet means for connecting the low-flow outlet chamber to the passage in the base for filtered oil to flow to the crankcase, said high-flow element being annular and the space inside it comprising said high flow rate outlet chamber.
Claim 8
Dependent Claim
208 words
An oil filter for attachment to an oil filter base of an internal combustion engine, said base having passages for incoming oil to be filtered and for filtered oil to flow to the engine bearings and to the crankcase, said filter comprising a housing having oil inlet means, a high flow rate filter element in the housing arranged to receive oil from the inlet means, a low flow rate filter element in the housing arranged in parallel with the high flow element to receive oil from the inlet means, first means defining an outlet chamber for oil passed through the high flow rate element, second means defining an outlet chamber for oil passed through the low flow rate element, hole means interconnecting said two outlet chambers to provide for flow from the chamber at higher pressure to the chamber at lower pressure, first outlet means for connecting said high flow rate outlet chamber to the passage in the base for filtered oil to flow to the bearings, said second outlet means for connecting the low-flow outlet chamber to the passage in the base for filtered oil to flow to the crankcase, said high-flow element being annular and the space inside it comprising said high flow rate outlet chamber.
Claim 9
Dependent Claim
27 words
An oil filter as set forth in claim 5 wherein said low-flow element is annular and the space inside it comprises said low flow rate outlet chamber.
Claim 10
Dependent Claim
47 words
An oil filter as set forth in claim 6 wherein said hole means includes a first bleed hole that is permanently open and a second hole having valve means therein providing for flow in one direction only from the low-flow outlet chamber to the high-flow outlet chamber.
Claim 11
Dependent Claim
218 words
An oil filter for attachment to an oil filter base of an internal combustion engine, saId base having passages for incoming oil to be filtered and for filtered oil to flow to the engine bearings and to the crankcase, said filter comprising a housing having oil inlet means, a high flow rate filter element in the housing arranged to receive oil from the inlet means, a low flow rate filter element in the housing arranged in parallel with the high-flow element to receive oil from the inlet means, first means defining an outlet chamber for oil passed through the high flow rate element, second means defining an outlet chamber for oil passed through the low flow rate element, hole means interconnecting said two outlet chambers to provide for flow from the chamber at higher pressure to the chamber at lower pressure, said hole means including a hole having valve means therein providing for flow in one direction only from the low-flow outlet chamber to the high flow outlet chamber, first outlet means for connecting said high flow rate outlet chamber to the passage in the base for filtered oil to flow to the bearings, and second outlet means for connecting the low-flow outlet chamber to the passage in the base for filtered oil to flow to the crankcase.
Claim 12
Dependent Claim
218 words
An oil filter for attachment to an oil filter base of an internal combustion engine, saId base having passages for incoming oil to be filtered and for filtered oil to flow to the engine bearings and to the crankcase, said filter comprising a housing having oil inlet means, a high flow rate filter element in the housing arranged to receive oil from the inlet means, a low flow rate filter element in the housing arranged in parallel with the high-flow element to receive oil from the inlet means, first means defining an outlet chamber for oil passed through the high flow rate element, second means defining an outlet chamber for oil passed through the low flow rate element, hole means interconnecting said two outlet chambers to provide for flow from the chamber at higher pressure to the chamber at lower pressure, said hole means including a hole having valve means therein providing for flow in one direction only from the low-flow outlet chamber to the high flow outlet chamber, first outlet means for connecting said high flow rate outlet chamber to the passage in the base for filtered oil to flow to the bearings, and second outlet means for connecting the low-flow outlet chamber to the passage in the base for filtered oil to flow to the crankcase.
Claim 13
Dependent Claim
32 words
An oil filter as set forth in claim 8 wherein said hole means includes a bleed hole that is permanently open and which is substantially smaller in size than said valved hole.
Claim 14
Dependent Claim
36 words
A filter device as set forth in claim 9 wherein said high-flow element is a depth type filter comprising a homogeneous body of resin-coated and cured uniform-diameter synthetic fibers having a preselected porosity and flow resistance.
Claim 15
Dependent Claim
59 words
A filter device as set forth in claim 10 wherein said low-flow element is a filter paper type element having initially less resistance to flow than the high-flow element but collecting contaminant at a greater rate than said high-flow element so that after a short period of use it has a greater resistance to flow than said high-flow element.
Claim 16
Dependent Claim
32 words
A filter as set forth in claim 8 wherein said first and second means include a separator wall between said filter elements and said hole means is formed in said separator wall.
Claim 17
Dependent Claim
36 words
A filter device as set forth in claim 12 wherein said wall includes a grommet to sealingly receive a tube on said base forming a part of the passage for oil to flow to the crankcase.
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |