Patents by Inventor David F. Knickerbocker

David F. Knickerbocker 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: 5647595
    Abstract: An apparatus for playing marbles including a first layer of foam material having an upturned perimeter for retaining marbles therewithin and a second layer of foam material affixed to an upper surface of the first layer and within the upturned perimeter. The first layer has a lip affixed thereto inwardly of perimeter and beyond an edge of the second layer. The lip extends transversely outwardly from the upper surface of the first layer. The lip is formed of a strip of foam material adhesively affixed to the upper surface of the first layer. The first layer is formable between a flat configuration and a bowl-shaped configuration. The first layer has a generally rectangular configuration with inwardly radiused corners when in the flat configuration. A hook-and-loop fastener is affixed to each of the radiused corners for forming the first layer into a bowl-shaped configuration.
    Type: Grant
    Filed: April 1, 1996
    Date of Patent: July 15, 1997
    Inventor: David F. Knickerbocker