Patents by Inventor Kyoichi Oku

Kyoichi Oku 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).

  • Method for the preparation of a pulp
    Patent number: 4118271
    Abstract: A process for the preparation of a pulp, involving the steps of mechanically milling a fibrous vegetable material at an elevated temperature, delignifying the milled material by reaction with a chlorine-containing compound and ammonia or ammonium hydroxide, and recovering the chlorine-containing compound from the waste liquor in the form of hydrochloric acid.
    Type: Grant
    Filed: August 10, 1976
    Date of Patent: October 3, 1978
    Assignee: Jujo Paper Co., Ltd.
    Inventors: Kyoichi Oku, Hiroshi Matsuura