Patents by Inventor Helmut Meinel

Helmut Meinel 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 arrangement for determining nitric oxide concentration
    Patent number: 3947685
    Abstract: A method and arrangement for determining the concentration of nitric oxide n a gas mixture, particularly exhaust gases, wherein a beam from a hollow-cathode tube is directed through a modulator, an absorption cell containing a gas mixture with an unknown concentration of nitric oxide, and a monochromator, to a beam detector. A readout arrangement displaying the concentration of nitric oxide gas is operatively connected to the beam detector.
    Type: Grant
    Filed: April 3, 1974
    Date of Patent: March 30, 1976
    Assignee: Deutsche Forschungs- und Versuchsanstalt fur Luft- und Raumfahrt e.v.
    Inventor: Helmut Meinel