Patents by Inventor Paul D. Keir

Paul D. Keir 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).

  • Phosphor system
    Patent number: 6419855
    Abstract: Phosphor compositions of the formula Zn1-3x/2MxX:Mn, wherein M is selected from the group consisting of the trivalent cations of Al, In, Ga, and mixtures thereof, and X is selected from the group consisting of S, Se, Te, and mixtures thereof are disclosed. Also disclosed are phosphor compositions of the formula, MX:Cu,L,A wherein M is selected from the divalent ions of Sr, Mg, Ca, Ba, X is selected from the group consisting of S, Se, Te, and mixtures thereof, and mixtures thereof, L is selected from the group consisting of the trivalent cations of the lanthanides, Al, In, Ga, Sc, and mixtures thereof, and A is selected from the alkali metal ions or mixtures thereof. Emission chromaticity of the phosphors is controlled by varying codopant concentrations. Electroluminescent devices comprising the phosphors also are disclosed.
    Type: Grant
    Filed: September 16, 1999
    Date of Patent: July 16, 2002
    Assignee: The State of Oregon Acting by and through the State Board of Higher Education on behalf of Oregon State University
    Inventors: Douglas A. Keszler, Dong Li, John F. Wager, Benjamin L. Clark, Paul D. Keir