TREA

using single frequencies for different subscribers

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Industry

  • CPC
  • H04Q5/10
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Parent Industries

HELECTRICITY H04Electric communication H04QSELECTING H04Q5/00Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange

Current Industry

H04Q5/10using single frequencies for different subscribers
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Frequency responsive selective ringing circuit
    • Patent number 4,959,853
    • Issue date Sep 25, 1990
    • Philip J. Del Monte
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Frequency selective ringer circuit
    • Patent number 4,653,093
    • Issue date Mar 24, 1987
    • Floyd Bell Associates, Inc.
    • Ely S. Zofan
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Ringing signal generator
    • Patent number 4,282,410
    • Issue date Aug 4, 1981
    • GTE Automatic Electric Labs Inc.
    • John A. Gauthier
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE