Patents Assigned to Telefonbau und Normalzeid G.m.b.H.
  • Electronic telephone systems
    Patent number: 3996424
    Abstract: A station direct station selection system is provided with a time division multiplex signalling line which carries all the signals that are required to establish and to terminate connections. The control means for establishing and terminating connections are decentralized and arranged mainly at the locations of the subscriber stations and at the locations of the line transmissions.
    Type: Grant
    Filed: August 23, 1974
    Date of Patent: December 7, 1976
    Assignee: Telefonbau und Normalzeid G.m.b.H.
    Inventor: Manfred Agricola
  • Signal interpreting system for frequency selective multifrequency tone dialing
    Patent number: 3963878
    Abstract: A signal interpreting system for frequency-selective multi-frequency tone dialing includes a code tester and a code converter, and two serially connected delay means processing the output of said code tester and having an output controlling logic circuitry arranged in the output circuits of said code converter.
    Type: Grant
    Filed: June 26, 1974
    Date of Patent: June 15, 1976
    Assignee: Telefonbau und Normalzeid G.m.b.H.
    Inventor: Arthur Kessler