Liquid additive slow-release apparatus driven by a filter pressure gradient

A filter assembly comprising:

• a housing defining an interior chamber;
• a filter element disposed within the housing and partitioning the interior chamber into an inlet region and a filtered region;
• a container positioned within the housing defining a reservoir, the container including a first opening providing fluid communication between the inlet region and the reservoir and a second opening providing fluid communication between the filtered region and the reservoir,
• wherein the second opening includes a capillary tube,
• wherein the capillary tube extends inside the container, and
• wherein the container has an upper wall portion and a lower wall portion defining a depth therebetween, and the capillary tube defines a flow path therein having a length greater than the depth of the container.

A filter assembly for filtering a fluid, said filter assembly comprising:

• a housing defining an interior chamber, the housing including a nut plate having an inlet and an outlet for the fluid;
• a filter element permeable to the fluid and disposed within the housing;
• a container positioned within the housing, the container defining a reservoir configured for receipt of a liquid additive, the container including a first opening allowing fluid entering from the inlet to flow into the reservoir and a second opening allowing a liquid additive deposited within the reservoir to flow to the outlet, wherein said second opening is constricted relative to the first opening to control the fluid flow into the container,
• wherein the second opening includes a capillary tube, and
• wherein the container includes a boss supporting the capillary tube.