Patents by Inventor Stearns T. Putnam

Stearns T. Putnam 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).

  • Cationic water soluble polymeric reaction product of polyaminopolyureylene-epichlorohydrin and nitrogen compound
    Patent number: 3966684
    Abstract: Disclosed are novel retention aid resins for paper fillers, said resins being derived by reaction of a nitrogen compound (such as ammonia) and a base resin which is the reaction product of an amino polymer and an epoxide difunctional toward amines. A specific example of such a base resin is a cationic water-soluble polyaminopoly-ureylene -- epihalohydrin resin.
    Type: Grant
    Filed: September 27, 1974
    Date of Patent: June 29, 1976
    Assignee: Hercules Incorporated
    Inventors: Herbert H. Espy, Stearns T. Putnam
  • Cationic water soluble polymeric reaction product of poly(diallylamine)-epihalohydrin and nitrogen compound
    Patent number: 3966694
    Abstract: Disclosed are novel retention aid resins for paper fillers, said resins being derived by reaction of a nitrogen compound (such as ammonia) and a base resin which is the reaction product of an amino polymer and an epoxide difunctional toward amines. A specific example of such a base resin is a cationic water-soluble poly(diallylamine)-epihalohydrin resin.
    Type: Grant
    Filed: September 27, 1974
    Date of Patent: June 29, 1976
    Assignee: Hercules Incorporated
    Inventors: Herbert H. Espy, Stearns T. Putnam
  • Cationic water soluble resinous reaction product of polyaminopolyamide-epichlorohydrin and nitrogen compound
    Patent number: 3951921
    Abstract: Disclosed are novel retention aid resins for paper fillers, said resins being derived by reaction of a nitrogen compound (such as ammonia) and a base resin which is the reaction product of an amino polymer and an epoxide difunctional toward amines. A specific example of such a base resin is a cationic, water-soluble aminopolyamide-epichlorohydrin resin.
    Type: Grant
    Filed: October 7, 1974
    Date of Patent: April 20, 1976
    Assignee: Hercules Incorporated
    Inventors: Herbert H. Espy, Stearns T. Putnam