KEYED THREAD ENGAGEMENT ON SCREW-ON FILTER ELEMENT Russian patent published in 2018 - IPC B01D27/08 F02M37/22 

FIELD: technological processes.

SUBSTANCE: invention relates to filtration. Filter element includes a ring of filtration media circumscribing a central axis and defining a central cavity. Annular end cap of the filter element is sealingly bonded at an end of the media. End cap includes a central opening into the central cavity, and a lateral opening spaced laterally outward from the central opening. Central opening includes a threaded connection portion to enable the element to be screwed-on to a complimentarily-threaded connection portion of a filter head. Connection portion of the central opening includes at least one slot opening which extends both axially and in a direction along a circle, and the opening extends radially away from the connection portion.

EFFECT: preventing the installation of the wrong filter.

9 cl, 10 dwg