Patents by Inventor Charles D. Gregor

Charles D. Gregor 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).

  • Homopolymers and copolymers of acrylamide N-substituted acrylamide or N-substituted methacrylamide solid state cross-linked with polyamines or polyols
    Patent number: 5280078
    Abstract: Cross-linked polymeric gels or films are prepared by dissolving in a suitable solvent a linear polymer or polymers at least one of which is predominantly (at least 80%) made from monomers containing pendant amidocarbonyl or oxycarbonyl groups. For the cross-linking reaction are present either hydroxyl groups, present as either pendant groups from the polymer, or as low molecular weight polyols; or amino groups, present as either pendant groups from the polymer, or as low molecular weight diamines or polyamines. Either no catalyst is present or a strongly acidic catalyst (which may also be a pendant group on a polymer) is used. The solvent is removed by coagulation and/or drying and the dry material is heat-cured, thus cross-linking and insolubilizing the polymer or polymers.
    Type: Grant
    Filed: September 23, 1991
    Date of Patent: January 18, 1994
    Inventors: Harry P. Gregor, Edgar Samuelson, Paul I. Dalven, Charles D. Gregor
  • Solid state cross-linked polymer
    Patent number: 4596858
    Abstract: Cross-linked polymeric gels or films are prepared by dissolving in a suitable solvent a linear polymer or polymers containing pendant amidocarbonyl or oxycarbonyl groups, hydroxyl groups present as either pendant groups from the polymer or as a low molecular weight polyol, and a strongly acidic catalyst (which may also be a pendant group on a polymer). The solvent is removed by coagulation and/or drying and the dry material is heat-cured, thus cross-linking and insolubilizing the polymer or polymers.
    Type: Grant
    Filed: June 20, 1984
    Date of Patent: June 24, 1986
    Inventors: Harry P. Gregor, Edgar Samuelsen, Paul I. Dalven, Charles D. Gregor