Patents by Inventor Andre T. Spears

Andre T. Spears 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).

  • Synthesis of ioversol
    Patent number: 5489708
    Abstract: The reduction of the O-alkyl isomer content of 5-[N-(2-acetoxyethyl)acetoxyacetamido]-N,N'-bis(2,3-diacetoxypropyl)-2,4,6 -triiodoisophthalamide to thereby reduce and/or eliminate the production of impurities comparatively more difficult to remove during the purification of crude ioversol.
    Type: Grant
    Filed: December 1, 1993
    Date of Patent: February 6, 1996
    Assignee: Mallinckrodt Medical, Inc.
    Inventors: Allan R. Bailey, Sharad S. Sathe, Andre T. Spears, Richard C. Wisneski, Mills T. Kneller