Patents by Inventor Chi H. Lee

Chi H. Lee 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: 20190166118
    Abstract: Improved systems and methods of authenticating a user using a mobile device to access a secure electronic portal are provided. A user may be enabled to quickly and securely log onto a website or other electronic portal using a handheld electronic device. In certain embodiments, multifactor authentication is utilized to improve the security of the authentication process.
    Type: Application
    Filed: November 29, 2018
    Publication date: May 30, 2019
    Inventors: Felix C.P. LEE, Jason SEVERN, Boris T.H. SO, Jason Chun Kit WAN, Kevin Chi Chung WONG
  • Patent number: 5596438
    Abstract: A photoconductive spread-spectrum communications system that includes a tsmitter and a receiver. The transmitter includes an oscillating laser, a Pockels' cell, a delay cell, a photoconductive switch, and an antenna for transmitting an electromagnetic spread-spectrum signal. The receiver includes an oscillating laser, a Pockels' cell, an antenna for receiving a spread-spectrum signal, a photoconductive switch, a filter, and a threshold detector for regenerating the signal contained within the spread-spectrum transmission.
    Type: Grant
    Filed: September 21, 1995
    Date of Patent: January 21, 1997
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Stephen E. Saddow, Eric Funk, Louis J. Jasper, Chi H. Lee
  • Patent number: 4805084
    Abstract: A device for converting DC to RF has a monolithic PIN diode adapted to be coupled to a DC supply. The diode receives light switching pulses and is coupled to a monolithic resonator. The monolithic form provides compactness and reliability, while the diode, which is reversed biased when OFF, prevents substrate leakage currents. The diode and the resonator can be made in a single substrate, e.g., silicon, or in different substrates, e.g., silicon for the diode to obtain a long carrier lifetime and, thus, minimize the light pulse repetition rate, and GaAs for the resonator to obtain a high Q. The resonator can also act as an impedance transformer.
    Type: Grant
    Filed: April 25, 1988
    Date of Patent: February 14, 1989
    Assignee: General Electric Company
    Inventors: Arye Rosen, Chi H. Lee
  • Patent number: 4538284
    Abstract: Locations of a desired number of signal points for a double side band-quadrature carrier modulation system occupy the inner intersections of a multiplicity of concentric rings with a triangular grid. The signal point locations of the desired number on the outer partially occupied ring are provided with additional signal points at positions selected to provide that the centroid of the set of locations is at the center of the rings.
    Type: Grant
    Filed: February 25, 1982
    Date of Patent: August 27, 1985
    Assignee: ESE Limited
    Inventors: Gordon R. Lang, George D. Forney, Jr., Shahid Qureshi, Fred M. Longstaff, Chi H. Lee
  • Patent number: 4514855
    Abstract: A sinusoidal component of phase jitter in a communications channel is reduced by apparatus including means providing an oscillator signal at the receiver and modifying the received signal phase in accord therewith. Decision means determine the probable transmitted signal and the signals at the input and output of the decision means are compared to determine the residual phase jitter. The residual phase jitter is compared with a suitably delayed oscillator signal and the results of the comparison are used to alter the modification (by the oscillator signal) of the received signal to further reduce the phase jitter. Preferably the results of the comparison are also used to reduce the frequency difference between the oscillator signal and the phase jitter.
    Type: Grant
    Filed: August 2, 1983
    Date of Patent: April 30, 1985
    Assignee: Ese Limited
    Inventors: Gordon R. Lang, Fred M. Longstaff, Chi H. Lee
  • Patent number: D370211
    Type: Grant
    Filed: March 28, 1995
    Date of Patent: May 28, 1996
    Inventor: Chi H. Lee