Patents by Inventor Helmut Riss

Helmut Riss 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).

  • Ultrasonic proximity switch
    Patent number: 4649527
    Abstract: This invention is of an ultrasonic proximity switch having a range selection control circuit. The range selection control circuit is in this instance separated from the sensor by being installed in a separate housing which can be mounted in the switching unit. It is equipped with a potentiometer in the form of encoding switches and an actual value display which can be designed in the form of an LCD design. In addition, various selector switches can be mounted in the housing.
    Type: Grant
    Filed: August 2, 1985
    Date of Patent: March 10, 1987
    Assignee: Siemens Aktiengesellschaft
    Inventors: Alfred Forster, Helmut Riss, Heinz Walker