Patents by Inventor Helmut Vorwerk

Helmut Vorwerk 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).

  • Remote control for radiotelephones
    Patent number: 4291411
    Abstract: A radiotelephone system having a control transmitter unit which includes a control unit having operating keys, a channel indicator device, a function indicator device and a loudspeaker/microphone device, the control transmitter unit including an ultrasonic or infrared transmitter for the transmission of the function signals required for operation of the radiotelephone system, the radiotelephone system further having a receiver unit provided with an ultrasonic or infrared receiver for actuating function and indicator devices.
    Type: Grant
    Filed: May 3, 1979
    Date of Patent: September 22, 1981
    Assignee: Robert Bosch GmbH
    Inventors: Horst Muller, Helmut Vorwerk