Patents by Inventor Doni G. Grande

Doni G. Grande 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).

  • Apparatus for measuring gaseous impurity in solids
    Patent number: 4970891
    Abstract: The apparatus of this invention provides an improved thermal conductivity detector for determination of low levels of gaseous impurities vaporized from solid samples. In particular, a hydrogen impurity vaporized from solid polysilicon beads can be determined down to a detectable limit of about 0.1 ppm by weight. The improvement is comprised of a syringe injection pump for calibration of the instrument, a computer for controlling the syringe infusion pump and for calculating the analytical results, and means for controlling pressure and mass flows of the gas streams.
    Type: Grant
    Filed: December 26, 1989
    Date of Patent: November 20, 1990
    Assignee: Ethyl Corporation
    Inventors: Donald R. Blevins, Gottlieb C. Gaeke, Jr., Doni G. Grande, Robert N. Sanders