Patents by Inventor Charitos Efstathiou

Charitos Efstathiou 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 of determining the refractive index of a substance and apparatus thereof
    Patent number: 4950074
    Abstract: The invention is directed to a method for determining the refractive index (n) of a substance wherein monochromatic light is conducted to a single-mode wave guide integrated into a substrate. The wave guide is brought into contact with the substance to be measured along a segment of predetermined length. In this way, the effective refractive index in this segment of the wave guide is changed. This effect is utilized for measuring the refractive index of the measured substance. The change of the effective refractive index causes a phase displacement of the light travelling through this measuring segment. This phase displacement is measured as a phase difference to a light component not influenced by the measuring substance. This measurement is preferably made interferometrically.
    Type: Grant
    Filed: May 2, 1989
    Date of Patent: August 21, 1990
    Assignee: IOT Entwicklungsgesellshaft fur Integrierte Optik-Technologie mbH
    Inventors: Norbert Fabricius, Helmut Oeste, Helga Gotz, Ludwig Ro.beta., Hans-Jurgen Guttmann, Jurgen Kluge, Jorg Baumgart, Charitos Efstathiou