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:
Apr. 13, 1993
Filed:
Jan. 14, 1992
Makoto Onishi, Kanagawa, JP;
Kenichi Shimura, Kanagawa, JP;
Terumo Kabushiki Kaisha, Tokyo, JP;
Abstract
In the method for preparing a porous membrane, a polymer having a low glass transition temperature is held on the surface of a porous membrane substrate and then drawing is conducted. Accordingly, the drawing at a high draw ratio can be conducted to which the substrate as such can not be subjected. As a result, not only an excellent porous membrane having an enlarged pore size and an increased void volume can be obtained but also it is possible to control the pore size and the void volume in wide ranges. Further, a hydrophilic polymer having a glass transition temperature of not more than 300 K is formed on the surface of pores of a porous membrane substrate by graft polymerization so as to bond the hydrophilic polymer on the substrate by a covalent bond. Therefore, it is possible to provide a porous membrane excellent in unbrittleness and inhibiting elution in an environmental liquid or the like.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile