Patents by Inventor Hershel L. Ezzell

Hershel L. Ezzell 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).

  • Metric conversion board
    Patent number: 4152845
    Abstract: An English to metric conversion chart is provided on the face of a wooden board between a pair of spaced parallel grooves extending up and down on the board. A Fahrenheit thermometer is mounted in one of the grooves and a Celsius thermometer is mounted in the other of the grooves. A sheet of transparent plastic covers the face of the board and the grooves.
    Type: Grant
    Filed: February 24, 1978
    Date of Patent: May 8, 1979
    Inventor: Hershel L. Ezzell