Patents by Inventor David Quon Lee

David Quon Lee 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).

  • Line conditioning and transfer circuit
    Patent number: 4071709
    Abstract: A circuit for electrically preconditioning a telephone line and switching an associated ringing generator on and off at the instant of opportune circuit conditions to eliminate circuit transients. The line circuit is switched by means of a relay so that an equipotential charge exists on either side of the switching contacts at closure and with zero current through the contacts at opening to eliminate suppression devices.
    Type: Grant
    Filed: December 16, 1976
    Date of Patent: January 31, 1978
    Assignee: GTE Automatic Electric Laboratories Incorporated
    Inventors: David Quon Lee, Richard Michael Rovnyak
  • Conference circuit for pulse coded modulated telephony
    Patent number: 4054755
    Abstract: A method of providing a multi-port conference circuit for use in a telephone switching system employing pulse coded modulated signals for transmission and supervision. Samplings of coded information are employed as a source of conference data and comparison with the digital information contained therein is employed to choose the speaker in a conference group. Included circuitry provides compensation for degradation caused by speech clipping and noise.
    Type: Grant
    Filed: October 14, 1976
    Date of Patent: October 18, 1977
    Assignee: GTE Automatic Electric Laboratories Incorporated
    Inventors: David Quon Lee, Donald W. McLaughlin