Patents by Inventor Kazutami Mitani

Kazutami Mitani 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 membranes and production processes thereof
    Patent number: 4961853
    Abstract: Disclosed are heat-resisting porous membranes or hydrophilized heat-resisting porous membranes comprising a polyolefin, especially a polyethylene or a polypropylene membrane having a crosslinked polymer held thereon, the crosslinked polymer being composed principally of (a) a polymerizable monomer containing one acid anhydride group or two esterified carboxyl groups or a monomer having at least one carboxylic group and (b) divinylbenzene, or of (a), (b) and further (c) styrene or a derivative thereof, or of (b) and (c). These membranes are prepared by thermally polymerizing some of monomer components from (a) through (c) held on at least a part of the surface of the porous membranes and optionally by further hydrophilizing the crosslinked polymer. The resulting porous membranes are useful for membrane separation requiring steam sterilization and for membrane separation of water of a high temperature.
    Type: Grant
    Filed: June 23, 1989
    Date of Patent: October 9, 1990
    Assignee: Mitsubishi Rayon Co., Ltd.
    Inventors: Hajime Itoh, Kouzi Ohbori, Kazutami Mitani, Hiroshi Takahashi, Kouji Takehashi, Kunihiro Aoki
  • Hydrophilized porous membrane and production process thereof
    Patent number: 4876289
    Abstract: The present invention discloses a hydrophilized porous membrane with a crosslinked hydrophilic polymer, which is composed principally of diacetone acrylamide, held physically on at least a part of the pore walls of a starting porous polyolefin membrane, as well as its production process. This hydrophilized porous polyolefin membrane has long-lasting hydrophilicity and good mechanical strength. Its components are dissolved out only minimally in application.
    Type: Grant
    Filed: July 1, 1988
    Date of Patent: October 24, 1989
    Assignee: Mitsubishi Rayon Co., Ltd.
    Inventors: Hajime Itoh, Kazutami Mitani
  • Hydrophilized porous polyolefin membrane and production process thereof
    Patent number: 4717479
    Abstract: The present invention discloses a hydrophilized porous polyolefin membrane with a polymer of a monomer, which has an HLB value of 2-20, held on at least a part of the pore walls of a porous polyolefin membrane as well as its production process. This hydrophilized porous polyolefin membrane has long-lasting hydrophilicity and good mechanical strength.
    Type: Grant
    Filed: March 27, 1987
    Date of Patent: January 5, 1988
    Assignee: Mitsubishi Rayon Co., Ltd.
    Inventors: Hajime Itoh, Kazutami Mitani
  • Hydrophilized porous membrane and production process thereof
    Patent number: 4695592
    Abstract: The present invention discloses a hydrophilized porous membrane with a crosslinked hydrophilic polymer, which is composed principally of diacetone acrylamide, held physically on at least a part of the pore walls of a starting porous polyolefin membrane, as well as its production process. This hydrophilized porous polyolefin membrane has long-lasting hydrophilicity and good mechanical strength. Its components are dissolved out only minimally in application.
    Type: Grant
    Filed: January 2, 1987
    Date of Patent: September 22, 1987
    Assignee: Mitsubishi Rayon Co., Ltd.
    Inventors: Hajime Itoh, Kazutami Mitani
  • Hydrophilized porous polyolefin membrane and production process thereof
    Patent number: 4678813
    Abstract: The present invention discloses a hydrophilized porous polyolefin membrane with a polymer of a monomer, which has an HLB value of 2-20, held on at least a part of the pore walls of a porous polyolefin membrane as well as its production process. This hydrophilized porous polyolefin membrane has long-lasting hydrophilicity and good mechanical strength.
    Type: Grant
    Filed: November 7, 1986
    Date of Patent: July 7, 1987
    Assignee: Mitsubishi Rayon Co., Ltd.
    Inventors: Hajime Itoh, Kazutami Mitani