Patents by Inventor Heui An

Heui An 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).

  • Distance measurement method and device using ultrasonic waves
    Publication number: 20060247526
    Abstract: The present invention provides a distance measurement method and device using ultrasonic sufficiently amplifying a received ultrasonic wave signal and separating a specific frequency from an ultrasonic wave signal mixed with an unnecessary signal to extract an arrival signal of a first pulse. It is thus possible to calculate a distance of an object safely.
    Type: Application
    Filed: July 29, 2004
    Publication date: November 2, 2006
    Inventors: Dong Lee, Heui An, Young Kang