Patents by Inventor Johann Hieninger

Johann Hieninger 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).

  • Data terminal interface circuit to a telephone transmission line
    Patent number: 4764922
    Abstract: At a transmission line (La', Lb') connected with telephone station equipment (Tel) via a lowpass filter (TP), via which telephone station signals are transmitted in a first frequency range, there is connected via a line transformer (U3) a data terminal (DG) which is able to receive and to send data signals in a second frequency range above the first frequency range. On its side toward the transmission line (La', Lb'), the lowpass filter (TP) has a capacitive termination (C7) which is rated so that its a-c resistance is in the order of magnitude of or preferably less than the characteristic impedance of the data transmission line in the second frequency range.
    Type: Grant
    Filed: August 18, 1986
    Date of Patent: August 16, 1988
    Assignee: Siemens Aktiengesellschaft
    Inventors: Georg Dieter, Johann Hieninger