Patents by Inventor Charles A. Daws

Charles A. Daws 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).

  • Vapochromic platinum-complexes and salts
    Patent number: 5766952
    Abstract: The present invention relates to a process for indicating the presence of organic vapors comprising the steps of determining the color, absorption or emission spectra of a Pt--Pt double-complex salt of platinum or a neutral platinum complex in the absence of organic vapor, exposing said double-complex salt of platinum or a neutral platinum complex to a gaseous environment, determining the color, absorption or emission spectra of said double-complex salt of platinum or a neutral platinum complex after exposure to said gaseous environment, and comparing the color, absorption and/or emission spectra of said double-complex salt of platinum or a neutral platinum complex in the absence of organic vapor with the color, absorption and/or emission spectra of said double-complex salt of platinum or a neutral platinum complex after exposure to said gaseous environment to determine if there is a difference in the color, absorption and/or emission spectra.
    Type: Grant
    Filed: July 25, 1996
    Date of Patent: June 16, 1998
    Assignee: Regents of The University of Minnesota
    Inventors: Kent R. Mann, Charles A. Daws, Christopher L. Exstrom, Daron E. Janzen, Marie Pomije