Patents by Inventor Yuzo Aboshi

Yuzo Aboshi 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 the preparation of optically active .alpha.-phenylglycine and intermediates thereof
    Patent number: 4115439
    Abstract: DL- .alpha.-phenylglycine can be combined with benzene-sulfonic acid, p-ethylbenzenesulfonic acid or m-xylenesulfonic acid to give the salt. The salt of the racemate may be more soluble in a sulfuric acid solution than the salt of the optically active isomer by suitably choosing the concentration of the sulfuric acid solution, and then the optical resolution by fractional crystallization is carried out. The D- or L- .alpha.-phenylglycine sulfonate is easily liberated of the sulfonic acid portion to give optically active D- or L- .alpha.-phenylglycine.
    Type: Grant
    Filed: March 25, 1976
    Date of Patent: September 19, 1978
    Assignee: Nippon Kayaku Kabushiki Kaisha
    Inventors: Shigeru Aoki, Yasuhisa Tashiro, Yuzo Aboshi, Toshiro Narita, Tadashi Shirai