Patents by Inventor Koiti Fujisawa

Koiti Fujisawa 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 preparing hexamethyltetrahydronaphthalenes
    Patent number: 4284818
    Abstract: 1,1,3,4,4,6-Hexamethyl-1,2,3,4-tetrahydronaphthalene (HMT), which is an intermediate for the production of acetyl HMT valuable in the art of perfumery because of its musk-like odor properties, is produced with industrial advantages by reacting p-cymene with 2,3-dimethylbutene using a catalytic amount of an anhydrous aluminum halide in the presence of at least one member selected from secondary alkyl halides, tertiary alkyl halides, propargyl halides and allyl halides; and 7-acetyl HMT is obtained by acetylation of the above-obtained HMT.
    Type: Grant
    Filed: March 12, 1979
    Date of Patent: August 18, 1981
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Hiroshi Sato, Koiti Fujisawa, Hideto Tojima, Seimei Yasui