Patents Assigned to Geochemical Services, Inc.
  • Patent number: 5066125
    Abstract: An inductively coupled plasma spectroscopy apparatus is provided in which an inductively coupled plasma torch and an analyte sample atomizer are integrally formed as a single unit. The atomizer portion of the apparatus includes two electrodes and a plasma nozzle through which a heating element is placed. Test samples may be placed into a sample vessel which is positioned within the heating element. The torch portion includes a glass containment wall surrounding at least a portion of the plasma nozzle to define a plasma chamber located immediately adjacent to the sample vessel. The glass containment wall contains a radio frequency (RF) coil wrapped about its periphery which is inductively coupled to a supply of gas. A variable rate cooling manifold is also provided about the periphery of the containment wall. The integral design effectively reduces the buildup of memory condensate within the apparatus, thereby decreasing contamination and improving the sensitivity of the results obtained.
    Type: Grant
    Filed: November 15, 1989
    Date of Patent: November 19, 1991
    Assignee: Geochemical Services, Inc.
    Inventors: Michael D. G. Rogers, William B. Henderson
  • Patent number: 4955717
    Abstract: A demand modulated electrothermal atomization plasma spectroscopy system intended to reliably and controllably atomize samples. The invention is used in conjunction with a plasma spectroscopic instrument, and includes a feedback control loop that monitors the rate of analyte consumption in a plasma torch and regulates the temperature of an electrothermal atomization means that supplies analyte material to the plasma torch. The feedback system in the preferred embodiment regulates atomization temperature based upon ion or photon count rates.
    Type: Grant
    Filed: June 29, 1988
    Date of Patent: September 11, 1990
    Assignee: Geochemical Services, Inc.
    Inventor: William B. Henderson