Patents by Inventor David Mantz

David Mantz 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: 4065126
    Abstract: A practice tennis ball and apparatus including a soft spherical member comprising a sewn cotton jacket enclosing a soft, cotton thread waste interior. A knit cover overfits the sewn jacket and may receive a marking powder suitable to removably indicate a contact upon a surface when the ball is in play. The knit cover removably overfits the sewn jacket to facilitate insertion of additional applications of marking powder. The apparatus includes targets in form suitable for application upon a vertical surface to receive the soft, pliable ball as it is propelled by a tennis racket.
    Type: Grant
    Filed: June 30, 1975
    Date of Patent: December 27, 1977
    Inventor: David Mantz