Patents by Inventor Yong-Wah Kim

Yong-Wah Kim 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).

  • Active Q-damping sub-system using nuclear quadrupole resonance and nuclear magnetic resonance for improved contraband detection
    Patent number: 6291994
    Abstract: A Q-damping subsystem for either an NQR or NMR contraband detection receiver for effectively reducing the dead time and increasing sensitivity of the contraband detection system. The invention acts as an addition to the standard transmit circuits of NQR and NMR based scanners and spectrometers. The active Q-damping devices require additional circuitry for an NQR/NMR detection receiver and a programming for the control thereof. Typically, the detection receiver generates a high-voltage RF pulse on the order of 200-1000 V with normal operation of 100-300 microseconds in length to provide sufficient magnetic field characteristics to perturb the precessing nuclei. The NQR or NMR detection receiver electronics are very sensitive and have to detect a very weak nuclear induction pulse signal that is in the nano/micro-volt range.
    Type: Grant
    Filed: January 14, 2000
    Date of Patent: September 18, 2001
    Assignee: Quantum Magnetics, Inc.
    Inventors: Yong-Wah Kim, Erik E. Magnuson, David C. Skvoretz