Patents by Inventor Jacobus H. Grobbelaar

Jacobus H. Grobbelaar 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).

  • Diamond radiation probe
    Patent number: 4888483
    Abstract: The invention provides apparatus for measuring nuclear radiation. The apparatus includes a probe which comprises a synthetic diamond and a FET pre-amplifier. A DC bias voltage is applied across the diamond and the pre-amplifier amplifies pulse or conduction signals from the diamond due to incident radiation. The pre-amplifier provides a first output having only an AC component, and a second output having both an AC and a DC component. A DC feedback stage applies a feedback signal to the input of the pre-amplifier to improve its dynamic range.
    Type: Grant
    Filed: October 26, 1988
    Date of Patent: December 19, 1989
    Inventor: Jacobus H. Grobbelaar
  • Shade determination
    Patent number: 4280625
    Abstract: The invention relates to the measurement of the shade of a particle. The particle is illuminated with light of variable intensity and viewed against a background level of illumination. A measurement is made of the ratio of time for which the intensity of light from the particle exceeds the intensity of the background to obtain a measurement of the shade of the particle.
    Type: Grant
    Filed: March 21, 1979
    Date of Patent: July 28, 1981
    Inventors: Jacobus H. Grobbelaar, Richard N. Colson, Charlie M. Levitt, Samuel Chatterley