Patents by Inventor Noriake Ohishi

Noriake Ohishi 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).

  • Process for preparation of cellulose nitrate films
    Patent number: 5055568
    Abstract: Disclosed is a process for the preparation of cellulose ester films, which comprises dissolving a cellulose ester in an organic solvent, coating the solution on a substrate under rotation and peeling the film formed on the substrate from the substrate, wherein a second organic solvent having a compatibility with the organic solvent and being a poor solvent to the cellulose ester is added to the organic solvent solution of the cellulose ester to precipitate a cellulose ester having a high molecular weight in the cellulose ester, the cellulose ester having a high molecular weight is separated from the solution, and the remaining cellulose ester solution is formed into a cellulose ester film by the rotational film-forming menthod.The cellulose ester film prepared according to this process is excellent in the thickness uniformity and free of color nonuniformity or streaks and has good optical properties.
    Type: Grant
    Filed: September 21, 1988
    Date of Patent: October 8, 1991
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Hiroaki Nakagawa, Masahiro Kondo, Noriake Ohishi
  • Process for preparation of cellulose ester films
    Patent number: 4812279
    Abstract: Disclosed is a process for the preparation of cellulose ester films, which comprises dissolving a cellulose ester in an organic solvent, coating the solution on a substrate under rotation and peeling the film formed on the substrate from the substrate, wherein a second organic solvent having a compatibility with the organic solvent and being a poor solvent to the cellulose ester is added to the organic solvent solution of the cellulose ester to precipitate a cellulose ester having a high molecular weight in the cellulose ester, the cellulose ester having a high molecular weight is separated from the solution, and the remaining cellulose ester solution is formed into a cellulose ester film by the rotational film-forming method.The cellulose ester film prepared according to this process is excellent in the thickness uniformity and free of color nonuniformity or streaks and has good optical properties.
    Type: Grant
    Filed: June 12, 1987
    Date of Patent: March 14, 1989
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Hiroaki Nakagawa, Masahiro Kondo, Noriake Ohishi