Patent ID: 8425772

Claim:
An oil filtration device comprising: a housing having a closed end, a fluid inlet and exiting end, and defining an interior space; a nut plate connected to the housing at the fluid inlet and exiting end, the nut plate defining an inlet for oil to enter the housing and an outlet for oil to exit the housing; a filter component contained entirely within the interior space of the housing between the closed end and the nut plate, the filter component arranged as a plurality of concentric filtering elements including an outer filtering element and an inner filtering element, a filter space being defined between the outer filtering element and the inner filtering element, each filtering element having a filter media configured to allow oil to flow through the filter media while removing contaminants from the oil, the inner filtering element defines a center space disposed along a central axis of the oil filtration device extending from a first end of the filter component to a second end of the filter component; a closed endplate connected to the second end of the filter component; an additive component contained entirely within the interior space of the housing and physically disposed between the filter component and the nut plate, the additive component includes a doughnut-shaped release vessel that is disposed about the central axis, the doughnut-shaped release vessel defining a central passage through which oil flows to the nut plate outlet; the doughnut-shaped release vessel includes a first end engaged with the first end of the filter component and a second end engaged with a gasket that is connected to the nut plate to seal between the nut plate inlet and the nut plate outlet; the doughnut-shaped release vessel includes an interior space containing an additive material in liquid form for release into the oil, the additive material is configured to treat or enhance the oil; and the doughnut-shaped release vessel includes an additive outlet opening that communicates the interior space thereof with the filter space, and the outlet opening opens into the filter space, the additive outlet opening is positioned to release the additive material into the filter space and the inner and outer filter elements, whereby the additive material is not released into the oil until the oil has entered the outer filtering element.