Patents by Inventor Willfried Krautkramer

Willfried Krautkramer 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).

  • Telecommunication switching network having a multistage reversed trunking scheme
    Patent number: 4245339
    Abstract: The switching network having a reversed trunking scheme of a PCM-(pulse code modulated -) exchange is formed by a first (time division) switching stage (A) consisting of individual switching groups (G l to G m) combined into one major switching group (GG), a second (space division) switching Stage (B1) formed by a number of PCM-lines equal to the number of switching groups (G l to G m) within one major switching group (GG), whereby each switching group is connected with a PCM-line in the outgoing direction, whereas a switching group individual multiplexer (M) performing the access of all PCM-lines to each switching group (G) and a third (space division) switching stage (B2) formed by a number of PCM-lines equal to the number of major switching groups (GG), the bitrate on said PCM-lines being a multiple number of the bitrate of the PCM-lines of the second (space division) switching stage.
    Type: Grant
    Filed: April 20, 1979
    Date of Patent: January 13, 1981
    Assignee: Telefonbau und Normalzeit, GmbH
    Inventors: Manfred Agricola, Willfried Krautkramer, Karl-Heinz Reimer