Patents by Inventor Man Sang Tam

Man Sang Tam 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 2,3-pentanedione
    Patent number: 5731471
    Abstract: A process for the preparation of purified 2,3-pentanedione from lactic compound which is lactic acid or a lactic acid ester. The process uses elevated temperatures between about 250.degree. to 370.degree. C. for heating a support (catalyst 16) and pressures between about 0.1 to 10 MPa to produce the 2,3-pentanedione in a reaction mixture. The lactic compound is converted primarily to 2,3-pentanedione, acrylic acid, and acetaldehyde at the elevated temperatures over the catalyst. The 2,3-pentanedione is preferably separated from the reaction mixture as an azeotrope with water at about 80.degree. to 90.degree. C. and then cooled to separate the 2,3-pentanedione from the water.
    Type: Grant
    Filed: October 25, 1995
    Date of Patent: March 24, 1998
    Assignee: Board of Trustees operating Michigan State University
    Inventors: Dennis J. Miller, James E. Jackson, Robert H. Langford, Garry C. Gunter, Man Sang Tam, Prashant B. Kokitkar