Patents by Inventor Frederick L. Caldwell

Frederick L. Caldwell 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: 6427675
    Abstract: An improved ball pitching apparatus for a ball pitching machine of the type having an upper and lower wheel, said wheels rotating on substantially parallel shafts and having generally aligned and spaced rims carrying peripheral ball gripping bands; independent speed controlled drive motors; a ball feeder for feeding the ball between the spaced rims so that the ball will be gripped and accelerated in a trajectory tangential to the rims; a head frame carrying the wheels, drive motors, and ball feeder; and, a stand carrying the head frame.
    Type: Grant
    Filed: August 22, 2000
    Date of Patent: August 6, 2002
    Inventors: Marcus L. Caldwell, Frederick L. Caldwell