Patent ID: 11946396
Assignee: LUBRICATION TECHNOLOGIES, INC.
Field: Chemical engineering (Chemistry)
Classification: CPC B  F | IPC B  F

Claim 8:
9. A filter assembly comprising:
a housing having a canister and a cover;
a pleated filter element having a plurality of pleats extending from a top end of the filter element to a bottom end of the filter element, each of the top end and the bottom end not having an integral end cap, and each pleat of the plurality of pleats sealed at the top end and the bottom end and adjacent pleats not sealed to each other;
a base plate received in the canister and having a plurality of apertures therethrough and a center perforated tube, the pleated filter element seated on the base plate and surrounding the center perforated tube, the base plate and center perforated tube separable from the pleated filter element;
a compression spring positioned between the bottom end of the filter element and a bottom of the canister;
a fluid inlet into the canister, a fluid outlet out from the canister in-line with the center perforated tube, and a fluid drain proximate or in the bottom of the canister, wherein:
when the filter element compresses the spring, the fluid drain is closed, and
when the spring lifts the filter element, the fluid drain is open.