Patents by Inventor Jurgen H. Achtermann

Jurgen H. Achtermann 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).

  • Precise determination of the compressibility factor of a gas from refractive index measurements
    Patent number: 4702604
    Abstract: A method and an apparatus for the precise determination of the compressibility factor of a gas sample are disclosed. Two grating interferometers are coupled together with one interferometer defining a refractive index interferometer adapted to provide a signal of information related to the refractive index of the gas sample and the other interferometer defining a pressure interferometer adapted to provide another signal of information related to the pressure of the gas sample whereby to permit measurement of the refractive index as a function of pressure. Each interferometer is capable of dividing a linearly polarized monochromatic laser beam into a measuring beam and a reference beam and causing the measuring beam and reference beam to travel along respective optical paths extending in close parallel relationship over predetermined optical path lengths.
    Type: Grant
    Filed: March 7, 1986
    Date of Patent: October 27, 1987
    Assignee: L'Universite du Quebec a Trois-Rivieres
    Inventors: Jurgen H. Achtermann, Tapan K. Bose, Jean-Marie St-Arnaud