Patents by Inventor Yoshihiko Mutoh

Yoshihiko Mutoh 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).

  • Porous fluorine resin membrane and process for preparing the same
    Patent number: 4702836
    Abstract: The invention relates to a porous membrane made of a particular fluorine resin, having excellent chemical resistance, excellent thermal resistance, excellent filtration performance and excellent mechanical properties, and having uniform porous structure comprising minute pores, and also relates to a process for preparing the same. In particular, the invention relates to a porous membrane suited for a microfilter having excellent thermal resistance and excellent filtration performance, especially a porous membrane suited for a microfilter for use in purification of chemicals such as strong acid and strong alkali by utilizing the excellent chemical resistance, and also a process for preparing the same.
    Type: Grant
    Filed: July 11, 1986
    Date of Patent: October 27, 1987
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Yoshihiko Mutoh, Morikazu Miura
  • Porous fluorine resin membrane and process for preparing the same
    Patent number: 4623670
    Abstract: The invention relates to a porous membrane made of a particular fluorine resin, having excellent chemical resistance, excellent thermal resistance, excellent filtration performance and excellent mechanical properties, and having uniform porous structure comprising minute pores, and also relates to a process for preparing the same. In particular, the invention relates to a porous membrane suited for a microfilter having excellent thermal resistance and excellent filtration performance, especially a porous membrane suited for a microfilter for use in purification of chemicals such as strong acid and strong alkali by utilizing the excellent chemical resistance, and also a process for preparing the same.
    Type: Grant
    Filed: December 13, 1985
    Date of Patent: November 18, 1986
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Yoshihiko Mutoh, Morikazu Miura
  • Method of dewaxing a vegetable oil
    Patent number: 4545940
    Abstract: A method of dewaxing a vegetable oil which comprises adjusting the temperature of a vegetable oil containing a wax to allow the wax to crystallize and subjecting the temperature-adjusted oil to filtration by means of a porous membrane having a critical surface tension (.gamma.c) of less than 33 dynes/cm and having an average pore diameter of 0.05 to 5 .mu.m, thereby selectively permeating the vegetable oil through the membrane while separating the wax from the vegetable oil. The process of the present invention is useful not only for dewaxing a vegetable oil but also for removing a wax together with a phospholipid, a free fatty acid and water from a crude vegetable oil.
    Type: Grant
    Filed: March 31, 1983
    Date of Patent: October 8, 1985
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Yoshihiko Mutoh, Kazuo Matsuda, Masashi Ohshima, Hiroo Ohuchi