Patents by Inventor James W. Kelfer

James W. Kelfer 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).

  • Figure eight wing drive
    Patent number: 4793573
    Abstract: A machine designed to move a pair of light weight graphite fiber composite covered wings in such a way that their tips will describe a horizontal figure eight through the air. Thereby sustaining an attack angle and creating lift throughout as much as 80% of their travel path. The mechanism retains 100% control over the wing movement and with a locking device in place the preferred embodiment should be capable of a good glide ratio.
    Type: Grant
    Filed: June 12, 1987
    Date of Patent: December 27, 1988
    Inventor: James W. Kelfer