Patents Assigned to Michael A. Dombrowski
  • Instructional device for tennis players
    Patent number: 4711633
    Abstract: An instructional device is provided for tennis players to identify their stroke problems and to analyze the cause of those stroke problems. In addition, the instructional device of the present invention includes a grip analysis section to help tennis players identify and correct their grip problems.
    Type: Grant
    Filed: March 31, 1986
    Date of Patent: December 8, 1987
    Assignee: Michael A. Dombrowski
    Inventors: Michael A. Dombrowski, Nancy M. Eikeland