Patents by Inventor Friedreich O. Heimers

Friedreich O. Heimers 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).

  • Ball retrieval device for ball games, particularly for tennis rackets
    Patent number: 7048653
    Abstract: A ball retrieval device, particularly for integration in a tennis racket, includes a rotatable spool with a longitudinally displaceable carriage arranged thereon. Through rotation of the spool, a rubber-elastic thread element can be wound up on the latter or unwound therefrom, the carriage providing a well-tuned process with maximum compactness of the turns. To this end, the surface of the spool is provided with a helical groove in which the thread element is laid.
    Type: Grant
    Filed: November 21, 2003
    Date of Patent: May 23, 2006
    Inventor: Friedreich O. Heimers
  • Ball retrieval device for ball games, particularly for tennis rackets
    Publication number: 20040127307
    Abstract: A ball retrieval device, particularly for integration in a tennis racket, comprises a rotatable spool with a longitudinally movable carriage arranged thereon. Through rotation of the spool, a rubber-elastic thread element can be wound up on the latter resp. unwound therefrom, said carriage providing a well-tuned process with maximum compactness of the turns. To this end, the surface of said spool is provided with a helical groove in which said thread element is laid.
    Type: Application
    Filed: November 21, 2003
    Publication date: July 1, 2004
    Inventor: Friedreich O. Heimers