Patents by Inventor Willi Lehmann

Willi Lehmann 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).

  • Calcium yttrium borate phosphor composition
    Patent number: 4202794
    Abstract: An improved phosphor composition excited by ultraviolet radiation to emit in the red region of the visible spectrum. The phosphor composition is expressible by the general constituent formulation xCaO.y(Y+Eu).sub.2 O.sub.3. zB.sub.2 O.sub.3 wherein x is from about 32 to 38, y is from about 31 to 41 and z is from about 25 to 31, with x, y and z expressing relative molar proportions of the constituents. The phosphor is activated by Eu. The relative molar proportions of the phosphor constituents are such that they fall within a predetermined area of a specified ternary phase diagram.
    Type: Grant
    Filed: October 25, 1978
    Date of Patent: May 13, 1980
    Assignee: Westinghouse Electric Corp.
    Inventor: Willi Lehmann