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:
Sep. 09, 1986
Filed:
Apr. 22, 1985
Herbert W Barch, Natrona Heights, PA (US);
PPG Industries, Inc., Pittsburgh, PA (US);
Abstract
A filter cartridge is structured of a filtration mat assembly wrapped or rolled about a central distribution tube. The filtration mat includes a plurality of hollow porous fiber strands carried by a fluid permeable sheet. Once the mat has been wrapped about the porous central distribution tube, both ends of the mat and distribution tube are firmly embedded in end caps. The central distribution tube is comprised of two tube segments which are telescopingly connected. Shrinkage and contraction or swelling and elongation of the mat's fibers cause the end caps to move toward or away from each other. This movement of the end caps is able to occur due to the ability of the telescoping central distribution tube to decrease or increase in length.