Patents by Inventor Ray A. Woodriff

Ray A. Woodriff 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 and apparatus for reduction of matric interference in electrothermal atomizer for atomic absorption spectroscopy
    Patent number: 4407582
    Abstract: The invention provides an improved method and apparatus for reduction of matrix interference in an electrothermal atomizer for atomic absorption spectroscopy. In a carbon rod atomizer within which a sample to be analyzed is atomized to the atomic state, the graphite furnace tube is electrothermally heated from the ends to the center where the sample is located. This provides sufficient thermal energy for complete decomposition of the sample molecules to the atomic state. In a first apparatus embodiment two-pronged substantially Y-shaped graphite electrode support holders for the graphite furnace tube are provided. In a second apparatus embodiment a double-walled graphite furnace tube is provided.
    Type: Grant
    Filed: January 12, 1981
    Date of Patent: October 4, 1983
    Assignee: The Research and Development Institute, Inc. at Montana State University
    Inventor: Ray A. Woodriff
  • Background correction in spectro-chemical analysis
    Patent number: 4035083
    Abstract: Various methods and apparatus are disclosed for providing a background corrected measure of the concentration of a sample element in absorption and emission spectro-chemical analysis using the principles of the Zeeman effect and certain other related effects using a magnetic field.
    Type: Grant
    Filed: May 5, 1975
    Date of Patent: July 12, 1977
    Inventors: Ray A. Woodriff, Daniel T. Woodriff