Patents by Inventor Fred G. Kral

Fred G. Kral 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: 4203602
    Abstract: A ball bumper for a pinball machine or the like having an inclined playing surface over which a metal ball travels for scoring purposes, the ball bumper including a plurality of post members secured to the playing surface, the post members having suspended therebetween an at least partially conductive resilient bumper member yieldable under impact by a rolling ball. Disposed rearwardly of the bumper member and in proximity to the bumper member is a solenoid actuated kicker arm. On the playing surface in proximity to the resilient bumper member is a conductive strip, the strip and the bumper member being connected to an electrical circuit which is completed by contact of the metal ball with the strip and bumper member to actuate the solenoid to drive the bumper member outwardly to thereby redirect the ball. The resilient bumper member may take the form of a rubber ring made of conductive rubber.
    Type: Grant
    Filed: August 1, 1977
    Date of Patent: May 20, 1980
    Assignee: Mattel, Inc.
    Inventor: Fred G. Kral