Patents by Inventor Thomas C. Claunch

Thomas C. Claunch 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).

  • Brown-photochromic glasses
    Patent number: 5482902
    Abstract: This invention is directed primarily to a composition for a photochromic glass which is essentially colorless in the undarkened state consisting essentially, expressed in terms of weight percent, of______________________________________ SiO.sub.2 54-58 TiO.sub.2 0-2 PbO 0-0.8 B.sub.2 O.sub.3 18-22 ZrO.sub.2 2-4.5 Sb.sub.2 O.sub.3 0-0.2 Al.sub.2 O.sub.3 7-8 Ag 0.155-0.175 Er.sub.2 O.sub.3 0-0.5 Li.sub.2 O 3.75-4.5 Cl 0.3-0.4 Au 0-5 ppm Na.sub.2 O 0-1 Br 0.08-0.11 Pd 0.8-1.2 ppm K.sub.2 O 5.5-7.5 CuO 0.0065-0.01 ______________________________________wherein the mole ratio Li.sub.2 O:Na.sub.2 O.gtoreq.9:1, said glass at a thickness of 2 mm exhibiting a coloration in the fully darkened state corresponding to the chromaticity coordinates, in accordance with the 1931 C.I.E. trichromatic colorimetric system, falling within area IJKLI in the appended drawing.
    Type: Grant
    Filed: December 21, 1994
    Date of Patent: January 9, 1996
    Assignee: Corning Incorporated
    Inventors: Thomas C. Claunch, Thomas G. Havens, David J. Kerko