Patents by Inventor Liane T. Tsai

Liane T. Tsai 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: 5574780
    Abstract: A telecommunication network includes a first telecommunication switch that supports subscribers coupled to the first switch and recognizes a request for call origination by a calling party on an associated communication line. The request for call origination services seeks services from a second switch. A first record in a database coupled to the second switch is located based on the identification of the calling party's line. The second switch is disposed at a hierarchical level above the first switch. A first set of predetermined features is determined based on information contained in the first record. A personal identification number of the calling party is received at the second switch. A second record in a database is located based upon the PIN; the second record is independent from the first record. A second set of predetermined features is determined based upon information contained in the second record.
    Type: Grant
    Filed: November 16, 1995
    Date of Patent: November 12, 1996
    Assignee: Lucent Technologies Inc.
    Inventors: Donald L. Andruska, Liane T. Tsai
  • Patent number: 5442689
    Abstract: In a method implemented by a telecommunications switch, a call request is made for a called party having a predetermined directory number. A determination is made if preconnection services are to be provided for the called party, and if such services are to be provided, a service node to provide the services is identified. A further determination is made if the call request is from other than the selected service node. If the call request is not from the selected service node, the call request is routed to the service node for preconnection services. If a call request is from the selected service node, the call is routed to the called party. This permits a selected service node to originate a separate call to the called party so that services can be provided on behalf of the called party in response to a call request made by a calling party. This method allows preconnection services to be provided without the requirement of multiple directory numbers being assigned to the called party.
    Type: Grant
    Filed: January 29, 1993
    Date of Patent: August 15, 1995
    Assignee: AT&T Corp.
    Inventors: Anthony Buttitta, Eric A. Duesing, Wayne R. Kalbow, Mark O. Rosstedt, Liane T. Tsai