Patents by Inventor Cezhan Chen

Cezhan Chen 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).

  • Full automatic electric shock protector apparatus
    Patent number: 4783713
    Abstract: An electric shock protector apparatus includes a circuit for detecting an electric shock current signal which has a frequency substantially higher than the line frequency of a power distribution system. The current of the power system is passed through a filter which eliminates the power supply frequency and produces a signal indicative of an electric shock current. The electric shock current signal is passed to positive and negative half-cycle operation signal circuits which transmit signals to a logic gate for operating a relay to disconnect the power source from the line conductors.
    Type: Grant
    Filed: March 6, 1987
    Date of Patent: November 8, 1988
    Inventor: Cezhan Chen