Patents by Inventor Edgar Lawrence Eckfeldt

Edgar Lawrence Eckfeldt 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).

  • Spectrochemical analyzer using surface-bound color reagents
    Patent number: 3998591
    Abstract: A spectrochemical analyzer utilizing a transparent medium such as quartz which has a color reagent coating the surface. When light is directed into the transparent medium, the magnitude of internal surface reflection varies with the change in absorptivity resulting from a color change in the reagent in response to a change in the chemical condition of the sample. By measurement of the light transmitted by the transparent medium the chemical condition of the sample is measured.
    Type: Grant
    Filed: September 26, 1975
    Date of Patent: December 21, 1976
    Assignee: Leeds & Northrup Company
    Inventor: Edgar Lawrence Eckfeldt