Patents by Inventor Richard Dang

Richard Dang 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).

  • Method of manufacturing glass beads for use in thermionic gas chromatographic detectors
    Patent number: 5198009
    Abstract: Alkali metal-containing glass beads for use as sources in thermionic detectors for gas chromatography are manufactured by a method which produces reproducible beads of preselected sizes. A glass tube of the desired composition is reduced to capillary size. A section having the volume of the desired bead is cut from the capillary tube and threaded onto a support wire. It is then melted and caused to coalesce onto the support wire. The resultant bead and a portion of the support wire are then incorporated into the detector.
    Type: Grant
    Filed: November 22, 1991
    Date of Patent: March 30, 1993
    Assignee: The Perkin Elmer Corporation
    Inventors: John E. Purcell, Richard Dang