Patents by Inventor Ralph A. Westwig

Ralph A. Westwig 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).

  • 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.
  • Fast-fading index-corrected photochromic glass compositions
    Patent number: 3957499
    Abstract: Photochromic glasses having index of refraction values (n.sub.D) in the range from 1.52-1.54, compositions comprising, in weight percent, about 49-60% SiO.sub.2, 2-9% Al.sub.2 O.sub.3, 15-18% B.sub.2 O.sub.3, 6-12% Na.sub.2 O, 9-18% ZrO.sub.2, 0.5-0.9% Ag, 0.5-0.8% Cl, 0.010-0.030% CuO, 0.5-1% PbO, and 1-2% F, and rapid fading characteristics such that at least about 65% of the optical density gained during darkening is lost within a five-minute fading interval, are disclosed.
    Type: Grant
    Filed: November 11, 1974
    Date of Patent: May 18, 1976
    Assignee: Corning Glass Works
    Inventors: Clark V. DeMunn, David J. Kerko, Ralph A. Westwig