Patents by Inventor Tsu-yung Chang

Tsu-yung 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).

  • Coded anti-theft system
    Patent number: 5218338
    Abstract: A coded anti-theft system of the present invention employs a keyswitch board, a number of relays and timers, and a number of peripherals including a first sensing device, a second sensing device, a starting device, an indicating device, and an alarming device. Aggressive activity is sensed by the sensing devices to sound the alarming device. The system is set with a code by a user, and only the user who enters the correct code can enable the starting device to start the vehicle.
    Type: Grant
    Filed: February 10, 1992
    Date of Patent: June 8, 1993
    Inventor: Tsu-yung Chang