Patents by Inventor Ralph M. Estes

Ralph M. Estes 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).

  • Self sealing gate valve
    Patent number: RE29299
    Abstract: .Iadd.A gate valve structure having a slab gate member and a pair of opposed seat assemblies on opposite sides of the gate member. The seat assemblies loosely fit in recesses in the housing and the dimensions of the gate member, seat assemblies and housing recesses are such that there is controlled interference between all sealing surfaces on assembly. An emergency sealant system provides emergency sealant to the face of the seat assemblies. .Iaddend.
    Type: Grant
    Filed: November 22, 1976
    Date of Patent: July 12, 1977
    Assignee: ACF Industries, Incorporated
    Inventors: Ralph M. Estes, Robert O. Wynn