Patents by Inventor Shigemitsu Yamada

Shigemitsu Yamada 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 determining catecholic compounds and their related compounds
    Patent number: 4319883
    Abstract: Disclosed are a method and an apparatus for determining catecholic compounds and their related compounds contained in a substance by utilizing the specific reactivity of the compounds with ferric chloride and potassium ferricyanide as reaction reagents. The reaction products are analyzed by spectrophotometry, preferably in combination with high-performance liquid chromatography, so as to determine catecholic compounds and their related compounds.
    Type: Grant
    Filed: March 26, 1980
    Date of Patent: March 16, 1982
    Assignee: ATTO Corporation
    Inventors: Kazuhiro Imai, Shigemitsu Yamada, Hidehiro Kubota, Jun Sakamaki