Patents by Inventor Ralph F. Sellers

Ralph F. Sellers 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).

  • Modified amine hardener systems
    Patent number: 4500582
    Abstract: A resinous hardener system comprising the reaction product of diamino diphenylsulfone compounds and diglycidyl ethers of polyhydric phenols. The hardener system can be incorporated into a variety of epoxy resins for use as improved prepreg or laminating resins, as resin molded castings, and the like.
    Type: Grant
    Filed: February 5, 1982
    Date of Patent: February 19, 1985
    Assignee: Ciba-Geigy Corporation
    Inventors: John J. King, Ralph F. Sellers, Richard N. Castonguay
  • Solid epoxy resin systems
    Patent number: 4440914
    Abstract: Solid epoxy resin systems comprising the reaction products of a polyepoxide compound with a functionality greater than two, a diglycidyl ether of a polyhydric phenol and a polyhydric phenol; said systems being applicable for use in a variety of applications and particularly in combination with phenolic novolac hardeners for molding applications.
    Type: Grant
    Filed: September 20, 1982
    Date of Patent: April 3, 1984
    Assignee: Ciba-Geigy Corporation
    Inventors: David Helfand, Ralph F. Sellers
  • Modified amine hardener systems
    Patent number: 4330659
    Abstract: A resinous hardener system comprising the reaction product of diamino diphenylsulfone compounds and diglycidyl ethers of polyhydric phenols. The hardener system can be incorporated into a variety of epoxy resins for use as improved prepreg or laminating resins, as resin molded castings, and the like.
    Type: Grant
    Filed: May 26, 1981
    Date of Patent: May 18, 1982
    Assignee: Ciba-Geigy Corporation
    Inventors: John J. King, Ralph F. Sellers, Richard N. Castonguay