Patents by Inventor Hisashi Okuyama

Hisashi Okuyama 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).

  • Methods of reproducing lactic acid components by using lactic acid based by-products
    Patent number: 6060622
    Abstract: A lactic acid based by-product formed in a process of producing a lactic acid based composition is subjected to racemization in the presence or absence of a catalyst to thereby obtain a lactic acid component having substantially optical inactivity. Then, lactide or polylactic acid having optical inactivity can be obtained from the lactic acid component having the optical inactivity. The obtained lactide or polylactic acid is mixed with lactide or polylactic acid having an optical purity in a range of 90 to 100% e.e. at a predetermined ratio to thereby obtain lactide or polylactic acid having a desired optical purity.
    Type: Grant
    Filed: October 24, 1997
    Date of Patent: May 9, 2000
    Assignee: Shimadzu Corporation
    Inventors: Hisashi Okuyama, Makoto Ogaito, Tatsushi Kawamoto, Takashi Kawabe, Yasumasa Horibe