The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 31, 1989
Filed:
Jun. 15, 1987
Peter Brownell, Providence, RI (US);
Allied-Signal Inc., Morristown, NJ (US);
Abstract
A liquid filter cartridge includes a centertube and a filtering media wrapped circumferentially about the centertube to provide a spirally wrapped media. The media includes a surface-type filtering medium having a predetermined porosity and a depth-type filtering medium which is disposed between the wraps of the surface-type filtering medium. The surface-type filtering medium is a filtering paper, and the depth-type filtering medium is an air laid batt which includes structural fibers tending to support the surface-type medium and to prevent the latter from collapsing under dynamic flow conditions. The depth-type medium is porous and offers little resistance to fluid flow, so that the liquid to be filtered can easily flow both radially from one of the layers of the surface-type medium to the adjacent layer, and also can flow circumferentially to thereby permit access for the liquid to be filtered over the entire area of the inner wraps of the surface-type medium.