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. 10, 2012
Filed:
Nov. 11, 2010
Applicants:
Hidetaka Okada, Minato-ku, JP;
Kouhei Kawahara, Minami-ashigara, JP;
Toshiki Taguchi, Minato-ku, JP;
Inventors:
Hidetaka Okada, Minato-ku, JP;
Kouhei Kawahara, Minami-ashigara, JP;
Toshiki Taguchi, Minato-ku, JP;
Assignee:
FUJIFILM Corporation, Minato-Ku, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B27J 5/00 (2006.01); B29C 67/00 (2006.01); D02J 1/22 (2006.01); B01D 39/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
To provide a membrane capable of efficiently collecting fine particles for a long period of time, disclosed is a polytetrafluoroethylene microporous membrane wherein the mean pore size in the surface of the membrane is larger than the mean pore size in the back thereof and the mean pore size continuously changes from the surface toward the back.