Patents by Inventor Jon R. Fisher

Jon R. Fisher 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 removing residual monomers and oligemers from amine-containing polymers
    Patent number: 5055197
    Abstract: Treatment of water-soluble, amine-containing polymers with strong acid, cation exchange resins from aromatic copolymer crosslinked with 2-25% polyvinyl crosslinker, followed by ultrafiltration with a membrane filter having a molecular-weight cutoff, measured against the polymers to be treated, of about 10,000 to about 15,000, results in a highly effective removal of residual monomers and oligomers of less than 500 molecular weight.
    Type: Grant
    Filed: April 5, 1991
    Date of Patent: October 8, 1991
    Assignee: Rohm and Haas Company
    Inventors: Robert L. Albright, Jon R. Fisher, Eric G. Isacoff, Eric C. Peters