Patents by Inventor Tomohiko Sadakata

Tomohiko Sadakata 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).

  • Burner igniter with a ceramic heater
    Patent number: 4741692
    Abstract: In a burner igniter using a ceramic heater, the resistance of the ceramic heater is detected to perform feedback control so that the temperature of the heater is maintained substantially constant to prevent both misfiring and overheating, while rapid temperature rise can also be obtained. The resistance value detected by a bridge circuit is fed to a proportional-integral controller which produces a control signal, while the current fed to the ceramic heater is also detected. The control signal and another signal indicative of the current to the ceramic heater are used to control a power source of the ceramic heater so that the current to the ceramic heater is controlled. A monitoring circuit responsive to both the resistance of the ceramic heater and the current fed to the ceramic heater may be added to warn a user that the life of the ceramic heater will soon end.
    Type: Grant
    Filed: October 1, 1985
    Date of Patent: May 3, 1988
    Assignee: Babcock-Hitachi Kabushiki Kaisha
    Inventors: Tomohiko Sadakata, Shigeyoshi Kawano