Patents by Inventor Hans Hochrath

Hans Hochrath 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).

  • Carrier frequency sound transmission system
    Patent number: 4209664
    Abstract: A carrier frequency sound transmission system which utilizes sound channels which correspond approximately to the bandwidth of three separate telephone channels and wherein a pilot tone is added to each of the sound channels and four sound channels are transmitted on a suitable carrier to a receiver where the pilot tone is utilized as an automatic frequency control signal to control a local injection oscillator for demodulating the four incoming sound channels.
    Type: Grant
    Filed: May 4, 1978
    Date of Patent: June 24, 1980
    Assignee: Siemens Aktiengesellschaft
    Inventor: Hans Hochrath