Patents by Inventor Kelvin D. Andersen

Kelvin D. Andersen 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).

  • Hard ball golf hat
    Patent number: 5289591
    Abstract: A protective plastic insert is provided for a conventional golf cap. The insert is substantially hemispherical and is engagable within the cap. The cap is size adjustable. The insert adapts to the size change of the cap. Thus a single size insert fits most golf caps. The shape and hardness of the plastic protect the wearer against the impact of a stray golf ball.
    Type: Grant
    Filed: October 25, 1991
    Date of Patent: March 1, 1994
    Inventor: Kelvin D. Andersen