Patents by Inventor Chang Cha

Chang Cha 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).

  • Publication number: 20070126649
    Abstract: An efficient device for air purification occurring in the presence of activated carbon or its equivalent by decomposing adsorbed impurities, such as volatile organic compounds, on the carbon surface by radiofrequency energy in the microwave range. The device contains an activated carbon bed, or its equivalent, for adsorption of impurities and is regenerated in-place by with radiofrequency energy in the microwave range by usage of one or more slot antennas. An oxygen-free sweep gas removes the impurities. The device is housed in a microwave cavity designed to reflect the microwaves leaving the slot antennas into a center section containing the activated carbon bed.
    Type: Application
    Filed: December 2, 2005
    Publication date: June 7, 2007
    Inventors: Chang Cha, Beau Braunberger
  • Publication number: 20070100919
    Abstract: A garbage collection unit and a garbage collection method in an embedded environment are provided. In the method, a memory is divided into a young generation area including first and second areas and an old generation area including a predetermined number of blocks, the young generation area is divided into two areas, the garbage collection is performed alternately in the first and second areas of the young generation area, and the garbage collection in the old generation area is performed gradually in units of individual frames including a predetermined number of blocks. Accordingly, time delay due to garbage collection can be minimized, thereby guaranteeing a real-time operation.
    Type: Application
    Filed: October 20, 2006
    Publication date: May 3, 2007
    Inventors: Sang Lee, Hee Won, Sang Kim, Chang Cha, Hyung Kim, Gyu Hwang
  • Publication number: 20050154248
    Abstract: An economically viable process for the microwave destruction of contaminated water-based liquids, such as by chemical and biological agents, employs carbonaceous materials to enhance the efficiency of the microwaves while keeping the bulk temperature down to only a modest rise. A second absorption reactor is used not employing microwaves. The cyclic microwave use of both reactors allows high efficiency for the total process of destruction—adsorption.
    Type: Application
    Filed: January 9, 2004
    Publication date: July 14, 2005
    Inventor: Chang Cha