Patents by Inventor David A Winchester

David A Winchester 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).

  • Portable spring type impact ball pitching device
    Patent number: 5975527
    Abstract: In a baseball, softball tennis practice ball throwing machine having a spring actuated pivot arm having a ball impact element at a free end thereof and biasing spring elements at its pivot end. A hand crank is attached to a pivot shaft for rotating the arm against the bias of the spring elements. A ball support station is provided to support a ball in the path of the ball impact element to be impacted and projected a distance by the arm as it rapidly rotate about the pivot shaft when under the influence of the biasing spring elements.
    Type: Grant
    Filed: January 13, 1997
    Date of Patent: November 2, 1999
    Inventor: David A Winchester