Patents by Inventor Frank E. Ledbetter, III

Frank E. Ledbetter, III 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).

  • Method for machining holes in composite materials
    Patent number: 4680897
    Abstract: A method for boring well-defined holes in a composite material such as graphite/epoxy. A slurry of silicon carbide powder and water is projected onto a work area of the composite material in which a hole is to be bored with a conventional drill bit. The silicon carbide powder and water slurry allow the drill bit, while experiencing only normal wear, to bore smooth, cylindrical holes in the composite material.
    Type: Grant
    Filed: December 3, 1985
    Date of Patent: July 21, 1987
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: Julia G. Daniels, Frank E. Ledbetter, III, Johnny M. Clemons, Benjamin G. Penn, William T. White
  • Process for producing tris (N-methylamino) methylsilane
    Patent number: 4474975
    Abstract: A method of producing tris (N-methylamine) methylsilane, including the steps of forming and cooling a liquid solution of methylamine in an inert solvent and under an inert atmosphere at a temperature of about -30.degree. C. and slowly adding a quantity of methyltrichlorosilane while maintaining said temperature. The reaction mixture is then heated for about 60 minutes at a temperature of about 40.degree. C., followed by filtering the solid portion from the liquid portion. The liquid is distilled to remove the solvent, resulting in a high yield of tris (N-methylamine) methylsilane.
    Type: Grant
    Filed: May 9, 1983
    Date of Patent: October 2, 1984
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: Johnny M. Clemons, Benjamin G. Penn, Frank E. Ledbetter, III
  • Method of bonding plasticized elastomer to metal and articles produced thereby
    Patent number: 4327150
    Abstract: Plasticized elastomer is securely bonded to a metal surface by interposing between the adhesive-coated metal surface and the elastomer a sheet of material obtained by combining adhesive with a portion of the elastomer that has been treated to remove plasticizers therefrom and heating the assembly in a mold under pressure. The sheet material is made up by dissolving a portion of the plasticized elastomer in an organic solvent, casting the solution, exposing it to a vacuum to remove the solvent and plasticizers, dissolving the de-plasticized material in liquid adhesive and casting and drying the resulting liquid.
    Type: Grant
    Filed: December 19, 1980
    Date of Patent: April 27, 1982
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: William T. White, Johnny M. Clemons, Frank E. Ledbetter, III