Patents by Inventor Marshall Evans

Marshall Evans 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).

  • Post manufacture process for improving the properties of lactones and substituted lactams
    Patent number: 5777131
    Abstract: This invention relates to a method for improving the properties of lactones and substituted lactams by subjecting the post-manufactured lactones and substituted lactams to an ion exchange resin. Specifically, this invention relates to a method for reducing the cationic impurities concentrations, reducing the amine concentration, and reducing the pH of post manufactured lactams.
    Type: Grant
    Filed: August 14, 1996
    Date of Patent: July 7, 1998
    Assignee: BASF Corporation
    Inventor: Marshall Evans