Patents by Inventor Kwokei J. Ng

Kwokei J. Ng 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 for the analysis of materials by chromatography and mass spectrometry
    Patent number: 4501817
    Abstract: To avoid the problem of instrumental drift encountered when using an open-split interface between a temperature-programmed gas-liquid chromatography column and a mass spectrometer, the inert gas supplied to the open-split interface and the interface itself are heated to a temperature above the maximum temperature attained by the chromatography column during the analysis.
    Type: Grant
    Filed: May 4, 1983
    Date of Patent: February 26, 1985
    Assignee: The Ohio State University
    Inventors: Brian D. Andresen, Kwokei J. Ng
  • Method and apparatus for the analysis of materials by chromatography and mass spectrometry
    Patent number: 4391778
    Abstract: To avoid the problem of instrumental drift encountered when using an open-split interface between a temperature-programmed gas-liquid chromatography column and a mass spectrometer, the inert gas supplied to the open-split interface and the interface itself are heated to a temperature above the maximum temperature attained by the chromatography column during the analysis.
    Type: Grant
    Filed: September 30, 1981
    Date of Patent: July 5, 1983
    Assignee: The Ohio State University
    Inventors: Brian D. Andresen, Kwokei J. Ng