Patents by Inventor Kenneth E. Graves

Kenneth E. Graves 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 of and apparatus for measuring and controlling the wall thickness of plastic pipes
    Patent number: 4152380
    Abstract: In the manufacture of plastic pipes by the extrusion process, the inside diameter of the pipe and, therefore, the wall thickness of the pipe is controlled by the takeaway speed at which the molten plastic pipe is removed from the sizing sleeve. An ultrasonic transducer is disposed at the upstream end of a sizing sleeve to provide signals representative of the thickness of the molten pipe advancing in the sizing sleeve. These signals are sent to devices for comparing the measured thickness of the molten plastic pipe with the desired thickness of the molten plastic pipe for producing a correction signal. The correction signal is employed for correcting the takeaway speed at which the molten plastic pipe is removed from the sizing sleeve.
    Type: Grant
    Filed: February 27, 1978
    Date of Patent: May 1, 1979
    Inventors: Kenneth E. Graves, Peter Angelbeck
  • Apparatus for measuring and controlling the wall thickness of plastic pipes
    Patent number: 4137025
    Abstract: In the manufacture of plastic pipes by the extrusion process, the inside diameter of the pipe and, therefore, the wall thickness of the pipe is controlled by the takeaway speed at which the molten plastic pipe is removed from the sizing sleeve. An ultrasonic transducer is disposed at the upstream end of a sizing sleeve to provide signals representative of the thickness of the molten pipe advancing in the sizing sleeve. These signals are sent to devices for comparing the measured thickness of the molten plastic pipe with the desired thickness of the molten plastic pipe for producing a correction signal. The correction signal is employed for correcting the takeaway speed at which the molten plastic pipe is removed from the sizing sleeve.
    Type: Grant
    Filed: March 7, 1977
    Date of Patent: January 30, 1979
    Inventors: Kenneth E. Graves, Peter Angelbeck