Patents by Inventor May Y. Chan

May Y. Chan 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).

  • Method and apparatus supporting short message services in a wireless number portability environment
    Patent number: 6535746
    Abstract: In a Wireless Number Portability (WNP) environment, a scheme is provided for routing and delivering Short Message Service (SMS) messages. In a WNP environment, the mobile identification number (MIN) and mobile directory number (MDN) will become independent, and the existing method of routing SMS messages will be inadequate to provide SMS to subscribers that port from one service provider to another. Methods and systems for delivering SMS messages to ported subscribers are provided.
    Type: Grant
    Filed: October 19, 2000
    Date of Patent: March 18, 2003
    Assignee: Verizon Laboratories Inc.
    Inventors: I-Hsiang Yu, May Y. Chan
  • Methods and apparatus for local number portability in telecommunication systems
    Patent number: 6445785
    Abstract: A telecommunication system supports local number portability. The system includes a local number portability switch and a local number portability database accessible by the local number portability switch. The local number portability database contains a table for translating geographic numbers to routing information. The local number portability switch queries the local number portability database using a dialed geographic number in response to initiation of a call. The local number portability database translates the dialed geographic number to corresponding routing information and returns the corresponding routing information to the local number portability switch. The local number portability switch uses the corresponding routing information to route the call.
    Type: Grant
    Filed: December 15, 1995
    Date of Patent: September 3, 2002
    Assignees: Verizon Laboratories Inc., Verizon Corporate Services Group Inc.
    Inventors: May Y. Chan, Blayne E. Maring, David Chin-Che Wang, I-Hsiang Yu
  • Method and apparatus for supporting short message services in a wireless number portability environment
    Patent number: 6240296
    Abstract: In a Wireless Number Portability (WNP) environment, a scheme is provided for routing and delivering Short Message Service (SMS) messages. In a WNP environment, the mobile identification number (MIN) and mobile directory number (MDN) will become independent, and the existing method of routing SMS messages will be inadequate to provide SMS to subscribers that port from one service provider to another. Methods and systems for delivering SMS messages to ported subscribers are provided.
    Type: Grant
    Filed: March 10, 1998
    Date of Patent: May 29, 2001
    Assignee: Verizon Laboratories Inc.
    Inventors: I-Hsiang Yu, May Y. Chan
  • Apparatus and method for local number portability using nongeographic subscriber numbers
    Patent number: 5764745
    Abstract: An apparatus and method for telecommunications network local number portability supports service provider portability, location portability, and service portability. A subscriber is assigned a nongeographic subscriber number that is uniquely mapped to a location-based geographic terminal location number. Different embodiments of the apparatus query different combinations of databases to obtain the nongeographic subscriber number to geographic terminal location number mapping that allows a call to a nongeographic subscriber number to be routed and delivered using existing network routing mechanisms. The originating switch determines whether a received called number is a geographic terminal location number or a nongeographic subscriber number that will require the originating switch to query a database to request that the number be mapped to a geographic terminal location number.
    Type: Grant
    Filed: December 15, 1995
    Date of Patent: June 9, 1998
    Assignee: GTE Laboratories Incorporated
    Inventors: May Y. Chan, Arthur A. Giordano, I-Hsiang Yu