Patents by Inventor Ki Woon Hwang

Ki Woon Hwang 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).

  • Ion mobility spectrometer utilizing flexible printed circuit board and method for manufacturing thereof
    Patent number: 5834771
    Abstract: There is an ion mobility spectrometer(IMS) comprising a ion drift tube comprising a reaction region, a shutter grid, a drift region and a collector; an inlet for introducing a carrier gas into the reaction region; and an ionization source in the reaction region, wherein flexible PCBs (printed circuit board) are fixed onto the surface of the ion drift tube to develop electric fields along the axis of the reaction region and the drift region for the movement of ions generated in the reaction region to the collector.
    Type: Grant
    Filed: April 16, 1997
    Date of Patent: November 10, 1998
    Assignee: Agency for Defence Development
    Inventors: Kyoung Won Yoon, Ki Woon Hwang, Ho Jin Lim, Seung Ki Choi, Hark Sang Kim