Patents by Inventor Larry Wayne Steffier

Larry Wayne Steffier 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).

  • Crosslinked methacrylic anhydride copolymers
    Patent number: 5639861
    Abstract: Suspension-polymerized, crosslinked copolymers of methacrylic anhydride yield beads suitable as precursors for weak-acid and other ion exchange resins, affinity chromatography materials and other materials which require spherical polymers having reactive anhydride groups for their preparation. Both gel and macroporous beads of these copolymers may be made by the process of the invention.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: June 17, 1997
    Assignee: Rohm and Haas Company
    Inventor: Larry Wayne Steffier