Patents by Inventor Se-Yeob Chang

Se-Yeob 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).

  • Electrical flame sensor for use in a gas cutting apparatus
    Patent number: 5470047
    Abstract: A flame sensor of the present invention for use in a gas cutting apparatus is capable of directly measuring an electrical current flowing through a flame formed between the torch and the workpiece and includes a first terminal coupled to the torch; a second terminal coupled to the workpiece; and a sensing portion for detecting a current between the first and the second terminals, and generating a current sense signal.
    Type: Grant
    Filed: June 23, 1994
    Date of Patent: November 28, 1995
    Assignee: Daewood Heavy Industries Co., Ltd.
    Inventors: Yoon-Sub Shin, Se-Yeob Chang, Sang-Jin Lee, Jae-Kon Kim