Patents by Inventor Haruhiko Sugiyama

Haruhiko Sugiyama 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).

  • Fulgimide derivatives
    Patent number: 5359085
    Abstract: A fulgimide derivative of the formula: ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 are independently alkyl cycloalkyl aryl etc.; R.sup.4 is thienyl, indolyl, furyl, etc.; X is a divalent organic residue; and R is amino, OH, etc., or a vinyl group, has a photochromic action and can be used for producing photochromic polymers and copolymers.
    Type: Grant
    Filed: July 27, 1990
    Date of Patent: October 25, 1994
    Assignee: Wako Pure Chemical Industries, Ltd.
    Inventors: Osamu Iwamoto, Taizo Hara, Haruhiko Sugiyama
  • Oxidizable color producing reagent
    Patent number: 5238818
    Abstract: This amount of an oxidative substance or a peroxidase-like substance can be determined by using a combined color former comprising 4-aminoantipyrine or a derivative thereof, etc., as a main color former and a p-fluoroaniline derivative or a salt thereof as a color producing component.
    Type: Grant
    Filed: November 26, 1991
    Date of Patent: August 24, 1993
    Assignee: Wako Pure Chemicals Co., Ltd.
    Inventors: Kazunari Hashizume, Haruhiko Sugiyama, Mutsuhiro Date
  • Oxidizable color producing reagent
    Patent number: 5164512
    Abstract: A triarylimidazole derivative of the formula: ##STR1## wherein X is O or S; Y is an arylsulfonyl group, an alkyl group, etc.; R.sup.2, R.sup.3 and R.sup.4 are independently an aryl group, etc., is stable in water or a buffer solution, high in measuring sensitivity and is suitable as an oxidizable color producing reagent for determining hydrogen peroxide, etc. generated by enzymatic reaction in a living body sample.
    Type: Grant
    Filed: June 19, 1990
    Date of Patent: November 17, 1992
    Assignee: Wako Pure Chemical Industries, Ltd.
    Inventors: Kazunari Hashizume, Haruhiko Sugiyama
  • Water-soluble cross-linked polymer of lysyl endopeptidase, process for preparing same and use of same
    Patent number: 4634671
    Abstract: A water-soluble cross-linked polymer of the enzyme lysyl endopeptidase produced by Achromobacter lyticus and a process for preparing the polymer as well as a semi-synthesis of human insulin using the polymer.
    Type: Grant
    Filed: September 19, 1983
    Date of Patent: January 6, 1987
    Assignee: Wako Pure Chemical Industries, Ltd.
    Inventors: Yoshitsugu Sakata, Akinori Shintani, Tetsuya Matsuo, Haruhiko Sugiyama, Nobuyuki Tokioka