Patents by Inventor Usao Nakamura

Usao Nakamura 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).

  • N.sup..epsilon. -trifluoroacetyl-L-lysyl-L-proline.D-10-camphorsulfonic acid salt and process for producing the same
    Patent number: 4868312
    Abstract: N.sup..epsilon. -Trifluoroacetyl-L-lysyl-L-proline.D-10-camphorsulfonic acid salt is produced in very high purity by reacting N.sup..epsilon. -trifluoroacetyl-L-lysyl-L-proline with D-10-camphorsulfonic acid in a suitable solvent, followed by crystallization from the reaction mixture.The salt is extremely stable at a temperature of working ambience as compared with other salts of N.sup..epsilon. -trifluoroacetyl-L-lysyl-L-proline including known dicyclohexylamine salt of the same.
    Type: Grant
    Filed: May 26, 1988
    Date of Patent: September 19, 1989
    Assignee: Hamari Chemicals Ltd.
    Inventors: Sadayuki Maeda, Usao Nakamura, Makoto Sakanaka
  • Biochemical method for preparation of optically active carnitine Enterobacter sp. Y-239-b
    Patent number: 4636471
    Abstract: L-carnitine is produced by bringing apocarnitine into contact with hydrase produced by a strain of Enterobacter in an aqueous medium having a pH of 4-10 at a temperature of 20.degree.-60.degree. C., whereby apocarnitine is converted to L-carnitine.
    Type: Grant
    Filed: April 5, 1984
    Date of Patent: January 13, 1987
    Assignee: Hamari Chemicals Ltd.
    Inventors: Usao Nakamura, Makoto Takao, Etsuko Ueno, Kichitaro Kawaguchi