Patents by Inventor Nga V. Chau

Nga V. Chau 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).

  • Patent number: 5751792
    Abstract: An adjunct message system, coupled to a global telecommunications network, provides a roaming subscriber with roaming access to messages left at the subscriber's home mailbox by transferring such messages to a temporary roaming mailbox at a roaming node when the subscriber first calls to retrieve his/her messages. In addition, messages left at any node in the system will be transferred to the subscriber's home node. In both cases, international voice transport costs will be saved.
    Type: Grant
    Filed: July 15, 1996
    Date of Patent: May 12, 1998
    Assignee: AT&T Corp
    Inventors: Nga V. Chau, Edward D. Eng, Henry H. Shen, Agnes C. Tow, Gang Yang
  • Patent number: 5333180
    Abstract: A Call Message Delivery System (CDS) in response to a request from a caller to deliver an international voice call message, uses the country code digits of the called station number to select the language to be used in the system announcement which precedes the delivery of the caller's message to the called station. Another feature enables the caller to select a system announcement to be delivered with the call message. An additional feature enables the caller to record his or her own announcement as the system announcement.
    Type: Grant
    Filed: September 23, 1991
    Date of Patent: July 26, 1994
    Assignee: AT&T Bell Laboratories
    Inventors: Percy B. Brown, Nga V. Chau, Tung-Hai K. Hsiao, Georg K. Karawas, Richard E. LeCronier, Dawn R. Parrott, Thomas L. Russell, Jr., Wen-Ping Ying
  • Patent number: 5187710
    Abstract: A call billing method and apparatus establishes an ISDN connection between the network and a called location which enables the called location to specify call billing information to the network, via the ISDN connection, on a call-by-call basis. The method provides the called party real time access to network rate tables to specify call billing parameters needed to generate a separate billing record for each call made to the called location. Other features enable the caller or called location to provide various types of information for call billing purposes.
    Type: Grant
    Filed: December 19, 1990
    Date of Patent: February 16, 1993
    Assignee: AT&T Bell Laboratories
    Inventors: Nga V. Chau, Reuben D. Hauptman, David D. Kaufman, Barbara J. Kittredge, Pamela J. Lauber, Patricia Lindblad
  • Patent number: 4972461
    Abstract: A call delivery service (CDS) apparatus and method are disclosed which enable non-subscriber callers to a common carrier network to bill a voice message delivery to their billing code, and to check the delivery status of the message from the network during a subsequent call. Optionally, at the caller's request, CDS can deliver the message status to the caller at a predesignated station. In one embodiment the caller can optionally request a response from the message recipient or answering party at the called station.
    Type: Grant
    Filed: September 20, 1989
    Date of Patent: November 20, 1990
    Assignee: AT&T Bell Laboratories
    Inventors: Percy B. Brown, Nga V. Chau, Tung-Hai Hsiao, Georg K. Karawas, Richard E. LeCronier, Dawn R. Parrott, Thomas L. Russell, Jr., Wen-Ping Ying
  • Patent number: 4939771
    Abstract: A Call Message Delivery system (CDS) enables an attendant to control the delivery of a recorded call message from a caller to a specified party at a called station. The CDS alerts the attendant at a delivery time, selected by either the caller or the system. When the attendant determines that the specified party has answered the call at the called station, the caller's recorded call message is outputted to the specified party. If the specified party is not available, the attendant may schedule the call for a later delivery or may forward the call to another station specified by the answering party at the called station.
    Type: Grant
    Filed: September 20, 1989
    Date of Patent: July 3, 1990
    Assignee: AT&T Bell Laboratories
    Inventors: Percy B. Brown, Nga V. Chau, A. R. Gore, Tung-Hai Hsiao, Georg K. Karawas, Richard E. LeCronier, Dawn R. Parrott, Usha Rao, Thomas L. Russell, Jr., Wen-Ping Ying