Patents by Inventor Makoto Sakanaka

Makoto Sakanaka 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