Patents by Inventor Richard T. Guttman

Richard T. Guttman 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).

  • Safety gate limit switch using Hall effect transducer
    Patent number: 4812674
    Abstract: A proximity switch has at least three Hall effect magnetic field sensitive transducers mounted in a transducer housing and has at least two magnets mounted in a magnet housing. The transucers produce logic signals, and a logic circuit responsive to these logic signals activates an electrical switch only when the magnets are in a proper position relative to the transducers. The electrical switch may be used to control a machine, and the machine is not activated until the proximity switch is activated.
    Type: Grant
    Filed: March 12, 1987
    Date of Patent: March 14, 1989
    Assignee: Square D Company
    Inventors: Horace O. Sue, Richard T. Guttman, David M. Pendley, William C. Keys