Patents by Inventor Mitsuhiro Mieno

Mitsuhiro Mieno 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 bleaching pulp with ozone with successive steps of lower consistency
    Patent number: 5368688
    Abstract: A method for bleaching pulp with ozone and, more specifically, to a method for bleaching pulp without deterioration of pulp quality. The starting material is a medium consistency pulp with easy handling during transfer and dewatering, namely, pulp of a consistency of about 10% by weight to 20% by weight. During the initial stage of the ozone bleaching process, the reaction velocity is maintained higher, while during the latter stage of the bleaching process, cellulose attack is prevented. Specifically, pulp bleaching is done with ozone, while the pulp consistency during the bleaching process is lowered in a stepwise manner within the range for a medium consistency pulp.
    Type: Grant
    Filed: May 17, 1993
    Date of Patent: November 29, 1994
    Assignee: Sumitomo Heavy Industries, Ltd.
    Inventors: Kouhei Miki, Takuya Yamamoto, Yoshiko Shishido, Mitsuhiro Mieno