Patents by Inventor Gerald F. Fetterer

Gerald F. Fetterer 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).

  • 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
  • 3-Port conference circuit for use in private automatic branch exchange
    Patent number: 4126766
    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 21, 1978
    Assignee: GTE Automatic Electric Laboratories Incorporated
    Inventors: Donald W. McLaughlin, Gerald F. Fetterer