Patents by Inventor Kouhei Kawahara

Kouhei Kawahara has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Crystalline polymer microporous membrane, method for producing same, and filter for filtration
    Patent number: 8153041
    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.
    Type: Grant
    Filed: November 11, 2010
    Date of Patent: April 10, 2012
    Assignee: FUJIFILM Corporation
    Inventors: Hidetaka Okada, Kouhei Kawahara, Toshiki Taguchi
  • CRYSTALLINE POLYMER MICROPOROUS MEMBRANE, METHOD FOR PRODUCING THE SAME, AN DFILTER FOR FILTRATION
    Publication number: 20110049044
    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.
    Type: Application
    Filed: November 11, 2010
    Publication date: March 3, 2011
    Applicant: FUJIFILM Corporation
    Inventors: Hidetaka OKADA, Kouhei Kawahara, Toshiki Taguchi
  • CRYSTALLINE POLYMER MICROPOROUS MEMBRANE, METHOD FOR PRODUCING SAME, AND FILTER FOR FILTRATION
    Publication number: 20090159526
    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.
    Type: Application
    Filed: May 18, 2007
    Publication date: June 25, 2009
    Applicant: FUJIFILM Corporation
    Inventors: Hidetaka Okada, Kouhei Kawahara, Toshiki Taguchi