Patents by Inventor Kikuo Ioshizumi

Kikuo Ioshizumi 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 production of optically active threo-3-(3,4-dihydroxyphenyl)serine
    Patent number: 4319040
    Abstract: Improved process for the production of optical aCTIVE (D- or L-) threo-3-(3,4-dihydroxyphenyl)serine, which comprises subjecting racemic threo-3-(3,4-dibenzyloxyphenyl)-N-carbobenzyloxyserine to optical resolution by using as a resolving reagent an optical active amino alcohol derivative, and then subjecting the resulting optical active (D- or L-) threo-3-(3,4-dibenzyloxyphenyl)-N-carbobenzyloxyserine to hydrogenolysis.
    Type: Grant
    Filed: July 18, 1980
    Date of Patent: March 9, 1982
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Naohito Ohashi, Shoji Nagata, Kikuo Ioshizumi, Junki Katsube