Patents by Inventor Jewett E. Popma

Jewett E. Popma 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).

  • Tennis scorekeeping device and method of using
    Patent number: 4202544
    Abstract: A device for keeping score of tennis games and sets is disclosed. The invention comprises a series of bands which slip onto the throat of the tennis racquet above the grip. In the present embodiment the bands are elastic. On the bands are symbols indicating the relation of games and sets. The bands are color coded to indicate opponents. For convenience, a reference dot is mounted on the racquet. Rotation of the respective bands relative to the reference dot shows the status of games and/or sets.
    Type: Grant
    Filed: November 18, 1977
    Date of Patent: May 13, 1980
    Inventor: Jewett E. Popma