Patents by Inventor Hirosaburo Ejiri

Hirosaburo Ejiri 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 2-methyl-3-prenyl-4,5,6-trimethoxyphenol
    Patent number: 4163864
    Abstract: 2-METHYL-3-PRENYL-4,5,6-TRIMETHOXYPHENOL OF THE FORMULA: ##STR1## wherein R represents a group of the formula: ##STR2## WHEREIN N IS AN INTEGER OF 0 TO 9 AND A and B represent hydrogen atom or A--B may form a bond,Is prepared by reacting 6-methyl-2,3,4-trimethoxyphenol with a prenol or isoprenol substituted by the group R as defined above in the presence of a complex catalyst comprising Lewis acid and a silica-alumina compound.
    Type: Grant
    Filed: February 16, 1978
    Date of Patent: August 7, 1979
    Assignee: Eisai Co., Ltd.
    Inventors: Eiichi Morita, Hirosaburo Ejiri, Keizo Takayanagi, Yukio Morita, Yasuhide Tanaka, Shizumasa Kijima, Kimio Hamamura, Isao Yamatsu