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. 29, 2008
Filed:
Aug. 24, 2005
Applicants:
Moon-seog Jang, Seoul, KR;
Sung-soo Kim, Seoul, KR;
Myung-nam Han, Seoul, KR;
Jin-ho Kim, Yongin-si, KR;
Min-soo Park, Seoul, KR;
Inventors:
Moon-Seog Jang, Seoul, KR;
Sung-Soo Kim, Seoul, KR;
Myung-Nam Han, Seoul, KR;
Jin-Ho Kim, Yongin-si, KR;
Min-Soo Park, Seoul, KR;
Assignee:
KMS Co., Ltd., , KR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D 39/00 (2006.01); B01D 39/26 (2006.01); B29C 47/00 (2006.01); B29C 47/12 (2006.01); B29C 71/00 (2006.01); D01D 5/14 (2006.01); B01D 63/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A porous polyethylene hollow fiber membrane having a pore-size gradient across the inner and outer surfaces thereof is prepared by introducing, during the cooling step of a melt-spun polyethylene hollow fiber, a nitrogen flow and a solvent having a boiling point in the range of 30 to 80° C. to the inner and outer surfaces of the melt-spun hollow fiber, respectively.