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

Claim 0:
1. A filter assembly comprising:
a housing having a canister and a cover threadedly engageable to the canister, the canister having a fluid inlet, a fluid outlet, and a fluid drain, the fluid drain proximate or in a bottom of the canister;
a pleated filter element having a plurality of pleats, each pleat sealed together at a top end of the pleat and at a bottom end of the pleat, adjacent pleats not sealed to each other, the filter element not having integral end caps at the top end or the bottom end, the filter element received in the canister; and
a compression spring positioned between a bottom of the filter element and the bottom of the canister; wherein:
when the cover is in a first position on the canister, the filter element compresses the spring and closes all fluid paths to the fluid drain, and
when the cover is in a second position, the spring lifts the filter element and opens a fluid path to the fluid drain.