Patents by Inventor E. D. Prueter

E. D. Prueter 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 manufacturing an improved plug valve
    Patent number: 4288896
    Abstract: A thermoplastic lined plug valve is prepared using a plug having a nonlocking taper and a stem at the small end of the plug. The plug is seated initially by forcing the plug into the plug cavity, raising the temperature of the plug valve above the service temperature of the valve body lining until the valve body lining conforms to the valve plug. The valve is then cooled to a temperature below the service temperature of the body lining.
    Type: Grant
    Filed: December 17, 1979
    Date of Patent: September 15, 1981
    Assignee: The Dow Chemical Co.
    Inventors: Walter H. West, E. D. Prueter
  • Plug valve and method
    Patent number: 4219046
    Abstract: A thermoplastic lined plug valve is prepared using a plug having a nonlocking taper and a stem at the small end of the plug. The plug is seated initially by forcing the plug into the plug cavity, raising the temperature of the plug valve above the service temperature of the valve body lining until the valve body lining conforms to the valve plug. The valve is then cooled to a temperature below the service temperature of the body lining.
    Type: Grant
    Filed: July 17, 1978
    Date of Patent: August 26, 1980
    Assignee: The Dow Chemical Company
    Inventors: Walter H. West, E. D. Prueter