Patents Assigned to Graseby-Anderson, Inc.
  • Sample injection apparatus and method
    Patent number: 5447556
    Abstract: An apparatus for sample concentration for gas chromatography and mass spectrometry for analysis for volatile organic compounds, including a hollow differential pressure switch to switch sample flow non-mechanically, and so that the gas chromatograph and apparatus may be used with different sample levels of volatile organic compounds by changing the timing and temperature parameters by changing the flow non-mechanically.
    Type: Grant
    Filed: March 4, 1994
    Date of Patent: September 5, 1995
    Assignees: Graseby-Anderson, Inc., United States of America
    Inventors: Joachim D. Pleil, Michael L. Stroupe