Patents by Inventor David Barry Willis

David Barry Willis 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).

  • Adjustable position counterweight assembly for amusement ride
    Patent number: 4032138
    Abstract: In a passenger propelled swinging ride assembly, a variable counterweight employing two eccentrically weighted wheels driven in opposite directions to effect a variable counterweight.
    Type: Grant
    Filed: June 28, 1976
    Date of Patent: June 28, 1977
    Assignee: Arrow Development Co., Inc.
    Inventor: David Barry Willis