Patents by Inventor David C. Hartman, Sr.

David C. Hartman, Sr. 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).

  • Miniature golf course
    Patent number: 5197738
    Abstract: A miniature golf course wherein an obstacle is positioned between the tee area and the putting cup hole. The obstacle includes a transparent housing containing a solenoid-controlled plunger which is actuated by a switch responsive to a putted golf ball. When actuated, the plunger propels a golf ball upwardly to a retrieving device which directs the golf ball to the putting surface in a predetermined direction relative to the putting cup hole.
    Type: Grant
    Filed: March 9, 1992
    Date of Patent: March 30, 1993
    Inventor: David C. Hartman, Sr.