Patents by Inventor Leo Shang-Hua Chang

Leo Shang-Hua 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).

  • Two-phase commit synchronizing seal state
    Patent number: 7358856
    Abstract: A conveyance tracking system provides two-phase transaction commit processing for synchronizing seal state information between a seal device attached to a conveyance and a host for tracking conveyances. The system uses a reader device for synchronization and communication between the seal device and host system regarding various operations, such as a lock operation, an unlock operation, and a clear tamper operation. In the first phase of the two-phase commit, the seal device prepares for the operation and the host executes the operation. In the second phase, the seal device fulfills the irreversible operation, ensuring that the seal state of the seal device and host are in sync.
    Type: Grant
    Filed: March 17, 2005
    Date of Patent: April 15, 2008
    Assignee: Savi Technology, Inc.
    Inventors: Ravindra U. Rajapakse, Leo Shang-Hua Chang, Joseph Siufai Chan, Jeyappragash Jeyakeerthi, Andrew Edward Savige Alcock