Patents by Inventor Charles E. Putnam, Jr.

Charles E. Putnam, Jr. 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).

  • Tennis ball tester
    Patent number: 5291774
    Abstract: A means of testing used tennis balls by inserting them between a compression arm with a pressure point midway of the ball and a base with backstop which also engages the ball. The weighted compression arm is allowed to fall on the ball and a reading is obtained at the forward end of the tester to determine if the ball is playable, practicable or should be discarded.
    Type: Grant
    Filed: April 14, 1993
    Date of Patent: March 8, 1994
    Inventor: Charles E. Putnam, Jr.