Patents by Inventor Eric Z. Riffl

Eric Z. Riffl 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).

  • Method and system for controlling a motorized wheelchair using controlled braking and incremental discrete speeds
    Patent number: 5497056
    Abstract: Method and system for controlling the operation of a motorized wheelchair where the motors have discrete predetermined speeds thus requiring little user intervention to operate and the motors may be controlled to act as generators to provide dynamic braking of the wheelchair.
    Type: Grant
    Filed: May 10, 1994
    Date of Patent: March 5, 1996
    Assignee: Trenton State College
    Inventors: Marvin Kurland, Thomas J. Noonan, David L. Martin, Eric Z. Riffl