Patent ID: 11925885
Assignee: CATERPILLAR INC.
Field: Chemical engineering (Chemistry)
Classification: CPC B  Y | IPC B

Claim 0:
1. A filter comprising:
a housing including an outer wall and an inner wall, wherein the outer wall and the inner wall define the same longitudinal axis, the inner wall defines a radial direction that passes through the longitudinal axis and that is perpendicular thereto, and a circumferential direction that is tangential to the radial direction and perpendicular to the longitudinal axis, and the inner wall is spaced radially away from the outer wall, the housing further defining a first end and a second end disposed along the longitudinal axis and a hollow interior;
an inlet in fluid communication with the hollow interior;
an outlet in fluid communication with the hollow interior;
a filter center tube disposed in the hollow interior comprising a plurality of layers; and
a cylindrical filter media disposed radially between the filter center tube and the outer wall, wherein:
each layer includes an undulating strip of solidified material; and
the undulating strip of each layer defines a plurality of pores between adjacent portions of the undulating strip, the plurality of pores having a minimum dimension less than 200 μm.