Patents by Inventor Toshiaki Tominaga

Toshiaki Tominaga 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).

  • Burn-in system, burn-in control technique, and semiconductor device production method using said system and technique
    Patent number: 6462574
    Abstract: A burn-in system, a burn-in control technique, and a semiconductor device production method utilizing the burn-in control technique are provided. The burn-in system of the present invention comprises a plurality of burn-in devices and an independent counter terminal. Each of the burn-in devices calculates a parameter indicating the number of mounted semiconductor devices, and generates measurement data indicating quality of the individual semiconductor devices collectively subjected to a burn-in test. The counter terminal adds up the parameters and measurement data sent from the burn-in devices. The counter terminal then calculates a failure rate based on the total parameter and the measurement data, and stops the burn-in test of each of the burn-in devices when the failure rate reaches a predetermined reference value.
    Type: Grant
    Filed: February 16, 2000
    Date of Patent: October 8, 2002
    Assignee: Fujitsu Limited
    Inventors: Hitoshi Izuru, Hiroyuki Yoshioka, Toshiaki Tominaga