Patents by Inventor Donald Max Henderson

Donald Max Henderson 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).

  • Hall effect rotary switch
    Patent number: 4054860
    Abstract: A Hall effect rotary switch includes a stator and a rotor. The stator mounts a row of spaced Hall effect sensing circuits. There are magnetic means for causing activation of the sensing circuits, with the rotor selectively positioning said magnetic means adjacent said Hall effect sensing circuits to provide coded outputs therefrom at different positions of the rotor.
    Type: Grant
    Filed: December 1, 1975
    Date of Patent: October 18, 1977
    Assignee: Oak Industries Inc.
    Inventors: Donald Max Henderson, Raymond F. Lewandowski