Patents by Inventor Lothar Herbert Riethmuller

Lothar Herbert Riethmuller 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 background absorption compensation in spectrophotometers
    Patent number: 4032235
    Abstract: The photoelectric detector output in the spectrophotometer is amplified with separate stages of fixed and variable gain to derive background absorption compensation when the intensity of the continuous spectrum emitting radiation source therein varies from optimum levels. Where a reference output of the photoelectric detector is desirable for the background absorption compensation, a dark interval of the photoelectric detector and an output channel are provided for each gain stage.
    Type: Grant
    Filed: November 24, 1975
    Date of Patent: June 28, 1977
    Assignee: The Perkin-Elmer Corporation
    Inventors: Hans Walter Kiefer, Lothar Herbert Riethmuller, Ernst Gunther Robert Spreitzhofer