Patents by Inventor David B. Rennhack

David B. Rennhack 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).

  • Patent number: 6332846
    Abstract: A head positioning device for use by a golfer including a mouthpiece and a rigid shaft affixed to and extending outwardly from the mouthpiece. The mouthpiece has a curved configuration. The shaft is affixed to the center of the curved configuration. The shaft extends radially outwardly of the mouthpiece. The shaft is a straight shaft. The mouthpiece has an interior area adapted to be received by teeth of the golfer.
    Type: Grant
    Filed: September 17, 1999
    Date of Patent: December 25, 2001
    Inventor: David B. Rennhack
  • Patent number: 5580321
    Abstract: A golf swing training device including a chamber having a liquid-receiving interior and a shaft connected to an end of the chamber. The shaft includes a gripping area opposite the chamber. A liquid partially fills an interior of the chamber. The chamber includes a tubular body, a first cap affixed in liquid-tight relationship to one end of the tubular body, and a second cap affixed in liquid-tight relationship to an opposite end of the tubular body. The shaft has the shape of a conventional golf club shaft. The movement of liquid within the chamber provides the golfer with immediate feedback as to the correctness of the swing.
    Type: Grant
    Filed: March 7, 1995
    Date of Patent: December 3, 1996
    Assignee: Swing Wave Golf Corporation
    Inventor: David B. Rennhack