Patents by Inventor John F. Petro

John F. Petro 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).

  • Digital telephony card for use in an operator system
    Patent number: 4879738
    Abstract: A device for establishing a desired operator audio level in an operator position means, is disclosed, comprising a processor means for processing digital signals for generating a desired receive audio level in an operator position means for use by an operator, conversion means for converting analog speech transmit signal from a telephone transmit means to digital for input to said processor means and for converting digital receive signal from the processor means to analog receive signal for input to a telephone receive means, and means for connecting the processor means to a telecommunications network. The processor means includes control means for the operator for permitting the operator to modify the desired receive audio level.
    Type: Grant
    Filed: February 16, 1989
    Date of Patent: November 7, 1989
    Assignee: Northern Telecom Limited
    Inventor: John F. Petro