Patents by Inventor Hiroyasu Koyama

Hiroyasu Koyama 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).

  • Nonaprenylamine derivatives
    Patent number: 4322555
    Abstract: This invention relates to new nonaprenylamine derivatives and the acid addition salts thereof, which are useful for controlling virus infection of vertebrate animals.
    Type: Grant
    Filed: April 22, 1981
    Date of Patent: March 30, 1982
    Assignee: Nisshin Flour Milling Co., Ltd.
    Inventors: Yoshiyuki Tahara, Hiroyasu Koyama, Yasuhiro Komatsu, Reiko Kubota, Toshihiro Takahashi
  • Isoprenylamines
    Patent number: 4265910
    Abstract: This invention relates to new isoprenylamines and the acid addition salts thereof. Further, the invention is concerned with antiviral agents for vertebrate animal, said agents containing as their active ingredients isoprenylamine or physiologically acceptable acid addition salt thereof.
    Type: Grant
    Filed: May 1, 1980
    Date of Patent: May 5, 1981
    Assignee: Nisshin Flour Milling Co., Ltd.
    Inventors: Yoshiyuki Tahara, Hiroyasu Koyama, Yasuhiro Komatsu, Reiko Kubota, Toshihiro Takahashi
  • 2-Hydroxy-3(4-alkylphenyl)-3-butenoic acid ester and process for the production thereof
    Patent number: 3959349
    Abstract: A new process for the production of a 2-(4-alkylphenyl)-propionic acid known as a valuable anti-inflammatory agent is now provided, which comprises treating an alkyl 2-hydroxy-3-(4-alkylphenyl)-3-butenoate, a new compound, with an alkali metal alcoholate in an alcohol to give the corresponding alkyl 3-methyl-3-(4-alkylphenyl)-pyruvate, also a new compound, which is then hydrolysed to liberate the corresponding 3-methyl-3-(4-alkylphenyl)-pyruvic acid, and then oxidising the liberated pyruvic acid compound to the desired 2-(4-alkylphenyl)-propionic acid. This new process is operable in a facile way with a high yield of the desired product and is much suitable for a commercial practice than the prior art methods.
    Type: Grant
    Filed: November 22, 1974
    Date of Patent: May 25, 1976
    Assignee: Nisshin Flour Milling Co., Ltd.
    Inventors: Katsura Kogure, Hiroyasu Koyama, Kunio Nakagawa