Patents by Inventor Clifford D. Dax

Clifford D. Dax 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).

  • High impedance differential input preamplifier and antenna for MRI
    Patent number: 7683619
    Abstract: Antenna assemblies for magnetic resonance signals comprise a non-resonant loop antenna and a high impedance differential amplifier. The amplifier can include first and second high electron mobility transistors that have gates coupled to an antenna loop that is defined on a rigid substrate. The non-resonant loop has an effective length of less than about 1/10 of a wavelength of a signal to be detected. Arrays of such loops can be defined on the rigid substrate, and HEMTs for the loops secured to the substrate.
    Type: Grant
    Filed: September 11, 2006
    Date of Patent: March 23, 2010
    Assignee: The State of Oregen Acting by and through the State Board of Higher Education on Behalf of the University of Oregon
    Inventors: Jolinda C. Smith, Clifford D. Dax, Ray L. Nunnally
  • High Impedance Differential Input Preamplifier and Antenna for Mri
    Publication number: 20080258731
    Abstract: Antenna assemblies for magnetic resonance signals comprise a non-resonant loop antenna and a high impedance differential amplifier. The amplifier can include first and second high electron mobility transistors that have gates coupled to an antenna loop that is defined on a rigid substrate. The non-resonant loop has an effective length of less than about 1/10 of a wavelength of a signal to be detected. Arrays of such loops can be defined on the rigid substrate, and HEMTs for the loops secured to the substrate.
    Type: Application
    Filed: September 11, 2006
    Publication date: October 23, 2008
    Inventors: Jolinda C. Smith, Clifford D. Dax, Ray L. Nunnally
  • Dynamically tunable notch filter
    Patent number: 5337056
    Abstract: A dynamically tunable notch filter is used within a continuously transmitting laser radar system for filtering narcissus signals generated from a continuous linear frequency modulated chirp transmission signal at the transmission aperture antenna with the filter including mixing and band pass filtering at the narcissus dynamic frequency to eliminate the unwanted narcissus signals varying over the dynamic frequency range of the narcissus signals, and to also eliminate unwanted target images, for improved resolution and detection of low level reflected target signals which are often obscured by the presence of the relatively high-level unwanted narcissus signals.
    Type: Grant
    Filed: June 11, 1993
    Date of Patent: August 9, 1994
    Assignee: Rockwell International Corporation
    Inventor: Clifford D. Dax
  • Tachometer noise reduction system using a pickup coil to cancel the noise from the tachometer signal
    Patent number: 5045784
    Abstract: A current carrying drive coil in a magnetic field is moved by the field. An attached tachometer coil, passing through the same field, produces a voltage from which the speed of the coils may be calculated. Changes in the drive coil current produce noise in the tachometer coil. This noise is offset by combining the tachometer voltage with the voltage produced by a stationary pickup coil, which picks up only the noise.
    Type: Grant
    Filed: August 21, 1989
    Date of Patent: September 3, 1991
    Assignee: Rockwell International Corporation
    Inventors: Frank A. Pizzarello, Clifford D. Dax