Patents Represented by Attorney Charles A. Doktycz

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  • Arrangement for conversion of random to fixed data channel format
    Patent number: 4201894
    Abstract: A private automatic branch exchange employing time division switching of digital signals, with provision for interfacing a fixed format data channel source to the randomly assigned channel allocation of the exchange. This is accomplished via channel buffering and channel address conversion under control of the branch exchange clock system.
    Type: Grant
    Filed: September 28, 1978
    Date of Patent: May 6, 1980
    Assignee: GTE Automatic Electric Laboratories Incorporated
    Inventor: Donald W. McLaughlin
  • Digital trunk supervisory decoder multiplexor for ground start or E&M signalling on a common T1 span
    Patent number: 4191857
    Abstract: Digital Carrier Trunks connected via a supervisory decoding and multiplexing logic to an electronic digital PABX. The circuit is arranged to receive or transmit the supervisory signal in either the "Ground Start", E&M modes or a combination of both in either the D2 or D3 signalling format over a T1 carrier span without converting to the analog signal form.
    Type: Grant
    Filed: September 28, 1978
    Date of Patent: March 4, 1980
    Assignee: GTE Automatic Electric Laboratories Incorporated
    Inventors: Donald W. McLaughlin, Julius Jusinskas, Jr.
  • Multiport conference circuit
    Patent number: 4175215
    Abstract: An improved conference technique whereby a number of channels in a telephone switching system employing pulse code modulation for transmission purposes are combined so that a number of subscribers may participate in a common telephone conversation. The conference circuit is provided with a continuous threshold to pass the primary signal and to exclude the reflection. It is only used in the selection process, and for conditions which do not provide the threshold being met, the previous speaker is retained.
    Type: Grant
    Filed: December 5, 1977
    Date of Patent: November 20, 1979
    Assignee: GTE Automatic Electric Laboratories Incorporated
    Inventors: Donald W. McLaughlin, Gerald F. Fetterer
  • Telephone stand
    Patent number: D254200
    Type: Grant
    Filed: December 21, 1978
    Date of Patent: February 12, 1980
    Assignee: GTE Automatic Electric Laboratories Incorporated
    Inventor: George M. Janda