Patents by Inventor Robert L. Kuehlthau

Robert L. Kuehlthau 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: 4334124
    Abstract: Apparatus for determining the position of a cursor with respect to a floating coordinate system, such as a menu. The floating menu incorporates two sensing devices similar to that in the cursor. A processing unit determines the position of the two sensing devices and the position of the cursor with respect to a fixed coordinate system. From this data the position of the cursor with respect to the floating menu is determined.
    Type: Grant
    Filed: March 26, 1980
    Date of Patent: June 8, 1982
    Assignee: Intergraph Corporation
    Inventors: Bruce E. Imsand, Robert L. Kuehlthau