Patents by Inventor Erich Schulz-DuBois

Erich Schulz-DuBois 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).

  • Volume-measuring method for surface depressions
    Patent number: 4944593
    Abstract: A method for measuring volume of surface depressions wherein the depression to be measured is or filled with a material which emits wavelength-shifted scatter light under irradiation. The material is illuminated with a light source whose wavelength lies in the absorption region of the material and the wavelength-shifted intensity of the scatter light of the material excited by the light source is measured with a photodetector, whereby the measured intensity is a measure of the volume of the surface depression.
    Type: Grant
    Filed: December 30, 1987
    Date of Patent: July 31, 1990
    Assignee: Dr. Ing. Rudolf Hell GmbH
    Inventors: Reiner Kalstroem, Erich Schulz-DuBois