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:
Nov. 23, 2010
Filed:
Aug. 09, 2005
Hideyuki Yokota, Otsu, JP;
Kimihiro Mabuchi, Otsu, JP;
Noriko Monden, Otsu, JP;
Noriaki Kato, Otsu, JP;
Yuuki Hatakeyama, Osaka, JP;
Takashi Sunohara, Osaka, JP;
Toshiaki Masuda, Osaka, JP;
Hideyuki Yokota, Otsu, JP;
Kimihiro Mabuchi, Otsu, JP;
Noriko Monden, Otsu, JP;
Noriaki Kato, Otsu, JP;
Yuuki Hatakeyama, Osaka, JP;
Takashi Sunohara, Osaka, JP;
Toshiaki Masuda, Osaka, JP;
Nipro Corporation, Osaka-shi, JP;
Abstract
The invention relates to a hollow fiber membrane module comprising polysulfone type selectively permeable hollow fiber membranes which contain a polysulfone-based resin and a hydrophilic polymer as main components, wherein (A) the content of the hydrophilic polymer in the uppermost layer of the inner surface of the hollow fiber membrane is at least 1.1 times larger than the content of the hydrophilic polymer in the proximate layer of the inner surface of the membrane, and (B) the content of the hydrophilic polymer in the uppermost layer of the outer surface of the hollow fiber membrane is at least 1.1 times larger than the content of the hydrophilic polymer in the uppermost layer of the inner surface of the membrane. The hollow fiber membrane module is exposed to a radioactive ray, on condition that the oxygen concentration of an ambient atmosphere around the hollow fiber membrane is from 0.001 to 0.1%, and that the moisture content of the hollow fiber membrane to the weight thereof is from 0.2 to 7 mass %.