Patents by Inventor Minoru Yotsuya

Minoru Yotsuya 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 bleaching fibrous material by hydrogen peroxide
    Patent number: 4378967
    Abstract: A fibrous material is bleached by hydrogen peroxide in a weakly acidic state at a pH of 5-7, and then in a weakly alkaline state at a pH of 8.5-1.1 by adding an alkaline agent to the hydrogen peroxide by one whole charge or continuously after the bleaching in the weakly acidic state and utilizing the remaining hydrogen peroxide. The bleached fibrous material has a soft handling and a high whiteness, and no bleaching unevenness.
    Type: Grant
    Filed: September 29, 1981
    Date of Patent: April 5, 1983
    Assignee: Mitsubishi Gas Chemical Co., Inc.
    Inventors: Minoru Yotsuya, Kiyoshi Mae, Seikyu Jinnouchi, Toshio Ochiai