Patents by Inventor Stefan Meiners

Stefan Meiners 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).

  • Apparatus for producing sample vapor for transferral into an inductively coupled plasma
    Patent number: 5247841
    Abstract: A graphite tube for electrothermal vaporization of a sample to be investigated is held between annular contacts through which a flow can be passed lengthwise through the graphite tube. The contacts surround the graphite tube in a shell-like manner; a protective gas flow can thus be passed into a cavity which is formed between the graphite tube and the contacts. The contacts are retained in cooling blocks. The sample is introduced into the graphite tube, vaporized, and carried into the plasma by means of a carrier gas flow which is passed through the longitudinal bore of the graphite tube. The graphite tube contains a radial sample infeed opening which can be closed by a controllable closure member applied to the graphite tube.
    Type: Grant
    Filed: January 21, 1992
    Date of Patent: September 28, 1993
    Assignee: Bodenseewerk Perkin-Elmer GmbH
    Inventors: Andrea Ulrich, Stefan Meiners, Rolf Tamm