Patents Represented by Attorney Gregory Hendricks

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  • Digital concentrator for use with a digital telephone office
    Patent number: 4385379
    Abstract: Signals from line circuits requesting service are transferred to a T1 channel via a Pulse Amplitude Modulated (PAM) bus. The number of line circuits which can be served by a T1 line is not limited by the capacity of the T1 line since the probability of all line circuits requesting service at the same time is extremely low. A processing unit detects requests for service and assigns them a slot in a memory which defines the scanning sequence for insertion of line circuit signals in the T1 channel.
    Type: Grant
    Filed: August 5, 1981
    Date of Patent: May 24, 1983
    Assignee: GTE Automatic Electric Labs Inc.
    Inventors: Michael J. Kelly, Robert L. Lindsay, Alex W. Kobylar, David J. Stelte
  • Microcomputer controlled key telephone line circuit
    Patent number: 4382163
    Abstract: A microcomputer controlled key telephone line circuit for use in a key telephone. A microcomputer is used to sequentially and alternately scan the ringing leads and tip and ring leads associated with connected line circuits and A leads associated with connected telephone stations. The microcomputer operates in response to changes in the status of these leads to control the normal key telephone functions such as line pickup, hold and ringing current detection, lamp illumination and tone signaling.
    Type: Grant
    Filed: July 27, 1981
    Date of Patent: May 3, 1983
    Assignee: GTE Automatic Electric Labs Inc.
    Inventors: Thomas E. White, Paul U. Lind