Patents by Inventor Paul W. Kopp

Paul W. Kopp 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).

  • Neutral gray, low transmittance, nickel-free glass
    Patent number: 5023210
    Abstract: A neutral gray, low transmittance (less than 20 percent luminous transmittance) soda-lime-silica glass has reduced solar energy transmittance, and in particular exceptionally low ultraviolet transmittance (less than 20 percent total solar ultraviolet transmittance) when provided with the following colorant constituents:Fe.sub.2 O.sub.3 (total iron) 0.4-0.7 percent by weightFeO 0.08-0.15Se 0.003-0.008CoO 0.003-0.025Cr.sub.2 O.sub.3 0.022-0.050The glass avoids the use of nickel compounds as colorants. Parameters for melting such a glass in a commercial furnace are also disclosed.
    Type: Grant
    Filed: November 3, 1989
    Date of Patent: June 11, 1991
    Assignee: PPG Industries, Inc.
    Inventors: John F. Krumwiede, Paul W. Kopp, Robert B. Heithoff