Patents by Inventor Kouzou Iwata

Kouzou Iwata 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).

  • Circuit for driving an electric field luminous lamp
    Patent number: 5144203
    Abstract: A circuit for driving an electric field luminous lamp includes a DC-DC converter for generating a constant DC electric power output. The DC electric power is inverted to an AC electric power to drive an electric field luminous lamp. This results in a constant consumption of an electric power, so that the decrease of a brightness is avoided, a life of the lamp becomes long, and a fluctuation of an input DC voltage does not affect a fluctuation of an electric power consumption.
    Type: Grant
    Filed: April 26, 1990
    Date of Patent: September 1, 1992
    Assignee: NEC Corporation
    Inventors: Yuji Fujita, Kouzou Iwata