Patents by Inventor Howard D. Hill

Howard D. Hill 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).

  • NMR tuning procedure
    Patent number: 4593246
    Abstract: The RF probe of a quadrature sensitive FT-NMR spectrometer is tuned and matched to its electrical environment by utilizing the phase quadrature sensitivity of said spectrometer to function as an impedance vector analyzer for the probe in situ. Phase and amplitude measurements of the in situ probe are compared to an occasionally measured and stored amplitude and phase characteristic observed when the probe is replaced by a 50 ohm terminator.
    Type: Grant
    Filed: September 12, 1984
    Date of Patent: June 3, 1986
    Assignee: Varian Associates, Inc.
    Inventor: Howard D. Hill
  • Geometric compensation of magnetic susceptibility perturbations in an RF spectrometer
    Patent number: 4563648
    Abstract: In a gyromagnetic analysis apparatus where the sample is spun about an axis to average over azimuthal inhomogeneities, the axial magnetic properties of the sample space are improved by shaping the coil conductor as a function of axial coordinate to exhibit a continuous, axially uniform magnetic susceptibility distribution in the sense of a cyclindrical average.
    Type: Grant
    Filed: September 22, 1983
    Date of Patent: January 7, 1986
    Assignee: Varian Associates, Inc.
    Inventor: Howard D. Hill
  • NMR Probe coil form structure
    Patent number: 4517516
    Abstract: An RF probe for a gyromagnetic resonance spectrometer includes a coil cage for supporting the probe coil preferably within the cage formed of a number of rod-like members displaced parallel to the coil axis and spaced apart from the axis at a constant distance. Access to the coil through an axial continuous slot 46 or equivalent eliminates axial discontinuity in susceptibility due to discrete holes in the coil form.
    Type: Grant
    Filed: April 8, 1983
    Date of Patent: May 14, 1985
    Assignee: Varian Associates, Inc.
    Inventors: Howard D. Hill, Albert P. Zens