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. 05, 1989
Filed:
Feb. 05, 1987
Applicant:
Inventors:
Lawrence Y Lo, Fitchburg, MA (US);
Dwight J Thomas, Zionsville, IN (US);
Assignee:
Parker-Hannifin Corporation, Cleveland, OH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
210490 ; 21050036 ; 264 49 ;
Abstract
Novel microporous, asymmetric, integral, composite piolyfluorocarbon, e.g., polytetrafluoroethylene, membranes are disclosed. These membranes are made up of two or more sheets of microporous fluorocarbon polymer having different average pore sizes, arranged to provide an increasing gradations in average pore size from one surface of the membrane to the other, and are useful as microfilters for removing fine particle contaminants, including bacteria, from fluids such as those encountered in the electronics and pharmaceutical industries.