Patents Represented by Attorney Kess VAN DER Sterre

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  • Method for making a brown photochromic glass
    Patent number: 4043781
    Abstract: A silver-halide photochromic glass of alkali-boroaluminosilicate base composition, having a brown coloration in the faded and darkened state, is provided by treating a potentially photochromic glass of specified composition according to a defined two-phase heat treatment to develop photochromic properties therein.
    Type: Grant
    Filed: May 24, 1976
    Date of Patent: August 23, 1977
    Assignee: Corning Glass Works
    Inventors: Clark V. DeMunn, David J. Kerko, Ralph A. Westwig, David B. Wrisley, Jr.