Patents by Inventor Noriyoshi Niimi

Noriyoshi Niimi 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 of recovering sodium hydroxide from sulfur free pulping or bleaching waste liquor by mixing ferric oxide with condensed waste liquor prior to burning
    Patent number: 4000264
    Abstract: This invention relates to a new and improved recovery method of chemicals from waste liquor of pulping or bleaching. More particularly, this invention relates to a method for direct recovery of sodium hydroxide from waste liquor of pulping or bleaching which is substantially free from sulfur compounds. Ferric oxide is admixed with concentrated waste liquor and thereafter the admixture is burned to form a smelt. By submerging the smelt in hot water a solution of sodium hydroxide and a ferric oxide precipitate are obtained. The precipitated ferric oxide can be reused in the mixing step.
    Type: Grant
    Filed: October 1, 1974
    Date of Patent: December 28, 1976
    Assignee: Toyo Pulp Co., Ltd.
    Inventors: Tadashi Nagano, Saisei Miyao, Noriyoshi Niimi