Patents by Inventor Charles L. Farris

Charles L. Farris 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).

  • Soft and firm denture liner for a composite denture and method for fabricating
    Patent number: 4543379
    Abstract: The invention provides a denture liner composition for a composite denture based on a phosphonitrilic fluoroelastomer (poly(fluoroalkoxy)phosphazene) curable at atmospheric pressure at temperatures of 100.degree. C. or less, conveniently by immersing the packed denture flask in a water bath at the appropriate temperature. The composition includes filler materials for increasing the hardness of the cured liner, interpenetrating polymers for increasing firmness and bond strength, and cross-linking agents for increasing the tensile strength and bond strength of the cured liner. The composite denture is preferably prepared in a one-step process wherein the liner composition material of a single firmness is cured in situ with the denture base material.
    Type: Grant
    Filed: December 8, 1983
    Date of Patent: September 24, 1985
    Assignee: Gulf South Research Institute
    Inventors: Lawrence Gettleman, Charles L. Farris, H. Ralph Rawls, Ralph J. LeBouef, Jr.
  • Soft and firm denture liner for a composite denture and method for fabricating
    Patent number: 4432730
    Abstract: The invention provides a denture liner composition for a composite denture based on a phosphonitrilic fluoroelastomer (poly(fluoroalkoxy)phosphazene) curable at atmospheric pressure at temperatures of 100.degree. C. or less, conveniently by immersing the packed denture flask in a water bath at the appropriate temperature. The composition includes filler materials for increasing the hardness of the cured liner, interpenetrating polymers for increasing firmness and bond strength, and cross-linking agents for increasing the tensile strength and bond strength of the cured liner. The composite denture is preferably prepared in a one-step process wherein the liner composition material of a single firmness is cured in situ with the denture base material.
    Type: Grant
    Filed: October 1, 1982
    Date of Patent: February 21, 1984
    Assignee: Gulf South Research Institute
    Inventors: Lawrence Gettleman, Charles L. Farris, H. Ralph Rawls, Ralph J. LeBouef, Jr.