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US 4,832,836 AGranted
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OwnerLeslie Selsdoninventor
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OwnerLeslie Selsdoninventor
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A filter unit including a housing element having a first and a second inlet for fluid and a first and a second outlet for fluid, flow passages defined in the housing defining a first path of flow for fluid between the first inlet and the first outlet of the housing, a flow passage defined in said housing defining a second path of flow for fluid between the second inlet and the second outlet of the housing, and a filter member in housing being capable of filtration to remove particles of dimensions greater than 5 micrometers, the second path of flow including a path through the filter and a by-pass about the filter having a resistance to flow of fluid no greater than that of the filter whereby in normal use a proportion only of fluid passing through the second flow path passes through the filter, provides fine filtration for an internal combustion engine and is attachable to a conventional engine filter mount.
A filter unit comprising a housing having a first inlet for fluid and an outlet for fluid, means defining a flow path in said housing for fluid between the first inlet and the outlet of the housing, a course filter means and a fine filter means arranged in longitudinal alignment in said housing, said fine filter means being provided for removing particles of dimensions of 5 micrometers and greater, means for dividing said flow path into a path through said fine filter means and a permanently open by-pass path adjacent to said fine filter means and means for rejoining said path through said fine filter and said by-pass path downstream of said fine filter means with said filter unit being configurated for continuous, simultaneous flow through said by-pass path and said path through said fine filter means, including a means for directing a proportion of fluid passing through the flow path passes through said fine filter means.
A fine filter unit for connection between a source of fluid to be filtered and a coarse filter unit with the fine filter adapted to be mounted directly to the said source, in which the fine filter unit comprises a housing having a pair of opposed end walls, a first and a second inlet for fluid and a first and a second outlet for fluid, the first inlet and the second outlet being situated in one said end wall and the second inlet and the first outlet being situated in the other said end wall, coupling means at both of said end walls with one coupling means fluidly connecting said first inlet and second outlet to said source of fluid through filter mounting means and the other coupling means fluidly connecting second inlet and first outlet to said coarse filter unit, means in said housing defining a first flow passage for fluid between the first inlet and the first outlet of the housing, means in said housing defining a second flow passage for fluid between the second inlet and the second outlet of the housing, and a filter member in said housing for removing particles of 5 micrometers and greater, wherein said second flow passage includes a path through said filter member and a by-pass path adjacent to said filter member with said filter unit being configurated for continuous, simultaneous flow through said filter member and said by-pass path including a means for directing a portion of fluid passing through the second flow path through said filter member.
Filtration apparatus comprising means defining a flow path between an inlet and an outlet for fluid to be filtered, said flow path constituting flow of liquid in series in which all of the fluid passes through a coarse filter member and a proportion of the fluid passes though a fine filter member for removing particles of 5 micrometers and greater, said fine filter member consisting of a roll of paper tissue material which is under radial compression which increases progressively in the flow direction, wherein the flow path includes a by-pass around said fine filter member for a proportion of fluid passing through the flow path which by-pass offers no greater resistance to flow than said fine filter member.
A fine filter unit for connection to a coarse filter unit providing inlet and return through flow paths, the fine filter unit comprising:
A filter unit comprising a housing having an end face containing an inlet for fluid and an outlet for fluid and having an opposite closed end, means defining a flow path in said housing for fluid between the inlet and the outlet of the housing, said flow path defining means including an axially extending tube extending from adjacent said closed end of the housing to said inlet for fluid, a coarse filter means and a fine filter means arranged in longitudinal alignment in said flow path in said housing, said fine filter means being for removing particles of dimensions of 5 micrometres and greater, means for dividing said flow path into a path through said fine filter means and a by-pass adjacent to said fine filter means, and means for rejoining said path through said fine filter means and said by-pass path downstream of said fine filter means with said filter unit being configurated for continuous, simultaneous flow through said by-pass path and said path through said fine filter means, in which a proportion only of fluid passing through the flow path passes through said fine filter means, wherein said coarse filter means and said fine filter means each surround axially separated portions of said tube and wherein said by-pass path extends between said fine filter means and said tube along the the fine filter means towards said closed end of the body portion.
Dependencies are inferred from the claim text.