Patents by Inventor Robert M. Andrews

Robert M. Andrews 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).

  • Practice tennis racket
    Patent number: 4032142
    Abstract: A practice tennis racket having a handle and peripheral frame corresponding to a conventional tennis racket. Extending across the frame is a flexible barrier net and a gridwork of yielding retaining strings. When a tennis ball is struck with the racket, the retaining strings permit the ball to pass therethrough to be caught in the net, with the strings retaining the ball in the net.
    Type: Grant
    Filed: September 12, 1975
    Date of Patent: June 28, 1977
    Inventor: Robert M. Andrews