Patents by Inventor Di-Jen Leu

Di-Jen Leu 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: 4727577
    Abstract: Method and apparatus are disclosed for recording information on the accumulated usage of a group of trunks interconnecting two networks. The apparatus includes two usage records that are alternately designated primary and secondary usage records during successive ones of consecutive time periods. In response to a call on a trunk, the primary usage record is decremented by an amount representing the time interval between the start of a given period and the commencement of trunk use. During the period, each trunk connected to a network office is examined for use once during the period. When a selected trunk is found in use, the secondary usage record is incremented by an amount representing the interval of time in the previously occurring time period.
    Type: Grant
    Filed: May 30, 1986
    Date of Patent: February 23, 1988
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventors: Alan E. Frey, Di-Jen Leu