Patents by Inventor Izumi Hoshuyama

Izumi Hoshuyama 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).

  • Heat resistant microporous film
    Patent number: 7635513
    Abstract: A heat resistant microporous membrane containing a thermoplastic resin having a crystalline melting point of 140-300° C. and having a layer structure formed in the direction of membrane thickness, said layer structure containing 5-100% of a layer defined by the following (A) and 95-0% of a layer defined by the following (B): (A) a layer in which the micropores are intra-spherulitic voids, and (B) a layer in which the micropores are intra-spherulitic voids and inter-spherulitic voids.
    Type: Grant
    Filed: October 20, 2000
    Date of Patent: December 22, 2009
    Assignee: Asahi Kasei Medical Co., Ltd.
    Inventors: Izumi Hoshuyama, Fujiharu Nagoya, Ichiro Koguma
  • Polyolefin microporous membrane
    Publication number: 20060103055
    Abstract: The present invention provides a polyolefin microporous membrane having a surface structure comprising fine spaces formed by partitioning micro-fibrils and a network formed by uniform dispersion of said micro-fibrils, wherein the average diameter of the micro-fibrils is 20 to 100 nm and the average distance between the micro-fibrils is 40 to 400 nm; and a process for producing said poly-olefin microporous membrane.
    Type: Application
    Filed: December 30, 2005
    Publication date: May 18, 2006
    Inventors: Izumi Hoshuyama, Takahiko Kondo