Patents by Inventor Shozo Sumikawa

Shozo Sumikawa 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 the preparation of malic acid crystals
    Patent number: 4035419
    Abstract: A process for producing crystals of malic acid having a uniform high purity using maleic acid or fumaric separately or together. The reaction mixture is cooled, resulting solids are separated and the resulting liquid is concentrated and then cooled to a specified temperature range according to the concentration of malic acid in weight %. The resulting solid is separated and the remaining liquid is cooled to 19.degree. to 21.degree. C to crystallize malic acid.
    Type: Grant
    Filed: February 17, 1976
    Date of Patent: July 12, 1977
    Inventors: Shozo Sumikawa, Shinichiro Sakaguchi, Tomoo Okiura
  • Process for the purification of malic acid
    Patent number: 3983170
    Abstract: A process for the purification of D,L-malic acid. An aqueous solution of D,-L-malic acid containing maleic acid and fumaric acid as impurities is treated with a strongly basic anion-exchange resin to remove the maleic acid and fumaric acid to provide substantially pure D,L-malic acid.
    Type: Grant
    Filed: December 6, 1974
    Date of Patent: September 28, 1976
    Assignees: International Organics, Inc., Kyowa Hakko Kogyo Co., Ltd.
    Inventors: Shozo Sumikawa, Rikichi Maida, Yuriaki Kageyama