Patents by Inventor Robert J. Londergan

Robert J. Londergan 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).

  • Electrical insulating compositions of epoxy resins, zirconium silicate and alumina
    Patent number: 4009141
    Abstract: Composition for use in making electrical insulating products such as transformer bushings comprises a mixture of cycloaliphatic epoxy resin, an anhydride curing agent, and a filler material including zirconium silicate and hydrated alumina. To provide for increased pot life of the material, the epoxy resin and a portion of the filler material are stored in one heated vessel while the anhydride curing agent and the remaining filler material are held in a separate heated vessel, the two components being mixed together prior to pouring the material into the product mold.
    Type: Grant
    Filed: July 7, 1972
    Date of Patent: February 22, 1977
    Assignee: General Electric Company
    Inventors: Frank S. Nichols, Charles H. Bliss, Robert J. Londergan