Patents by Inventor Jo-Mei Chang

Jo-Mei Chang 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: 4725834
    Abstract: A system, station apparatus and protocol for broadcasting messages to a plurality of stations which contemplate a primary receiver, also called a token site. The primary receiver is adapted to receive and store information messages transmitted from a source station to a broadcast group stations. The source continues to retransmit the broadcast message until it receives an acknowledgment control message from the primary receiver. In the event some receiver or receivers in the broadcast group do not receive the broadcast message, such receiver or receivers could request a retransmission of the message. The primary receiver, not the source station, would retransmit the broadcast message, thereby assuring a reliable broadcast system. The token site function can be rotated among the various receivers in the broadcast group to reduce storage costs. The possible token sites are identified in a token list to which stations may be added or from which stations may be deleted.
    Type: Grant
    Filed: May 28, 1987
    Date of Patent: February 16, 1988
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventors: Jo-Mei Chang, Nicholas F. Maxemchuk