Patents by Inventor Paul Harwood Aldrich

Paul Harwood Aldrich 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).

  • Sizing paper with stable dispersions of hydrocarbon resins
    Patent number: 4109053
    Abstract: Disclosed are essentially stable aqueous dispersions of hydrocarbon resins which consist essentially of at least one hydrocarbon resin in finely-divided form; a water-soluble cationic resin, a specific example of which is a water-soluble cationic aminopolyamide--epichlorohydrin resin; and water. The dispersion can be used to size paper.
    Type: Grant
    Filed: December 15, 1975
    Date of Patent: August 22, 1978
    Assignee: Hercules Incorporated
    Inventor: Paul Harwood Aldrich
  • Water-dispersible thermosettable cationic resins from reaction of (1) water soluble amino polyamide, (2) acid anhydride and (3) epihalohydrin
    Patent number: 4087395
    Abstract: Disclosed are novel water-insoluble, water-dispersible thermosettable cationic resins derived by reaction of a water-soluble aminopolyamide, a hydrophobizing compound such as a ketene dimer and an epihalohydrin such as epichlorohydrin. The thermosettable cationic resins are water-dispersible, and aqueous dispersions thereof are stable for prolonged periods of time at relatively high solids concentration. The thermosettable cationic resins have particular utility in the sizing of paper.
    Type: Grant
    Filed: April 13, 1977
    Date of Patent: May 2, 1978
    Assignee: Hercules Incorporated
    Inventors: Paul Harwood Aldrich, David Howard Dumas
  • Aqueous dispersions of wax blends and a water-soluble cationic resin and paper sized therewith
    Patent number: 4017431
    Abstract: Disclosed are essentially stable aqueous dispersions of wax--fatty acid blends, wax-ketene dimer blends, or mixtures thereof; a water-soluble cationic resin dispersing agent; and water. The dispersions are useful in the sizing of paper.
    Type: Grant
    Filed: June 17, 1976
    Date of Patent: April 12, 1977
    Assignee: Hercules Incorporated
    Inventor: Paul Harwood Aldrich
  • Stable aqueous dispersions of hydrocarbon resins and water soluble polyaminopolyamide-epichlorohydrin resin as dispersing agent
    Patent number: 3941736
    Abstract: Disclosed are essentially stable aqueous dispersions of hydrocarbon resins which consist essentially of at least one hydrocarbon resin in finely-divided form; a water-soluble cationic resin, a specific example of which is a water-soluble cationic aminopolyamide--epichlorohydrin resin; and water. The dispersion can be used to size paper.
    Type: Grant
    Filed: November 5, 1973
    Date of Patent: March 2, 1976
    Assignee: Hercules Incorporated
    Inventor: Paul Harwood Aldrich