Phototropic glass with a brown tint in the irradiated state

US4485178A · kind A · utility

Assignee

• Schott Glaswerke · DE

Inventors

• Georg Gliemeroth · Eltville am Rhein, DE
• Uwe Eichhorn · Großerkmannsdorf, DE
• Eva Holzel · Ingelheim am Rhein, DE
• Ludwig Ross · Klein-Winternheim, DE
• Hans-Georg Krolla · Mainz, DE
• Burkhard Speit · Mainz, DE
• Volkmar Geiler · Ingelheim am Rhein, DE
• Hans-Jurgen Hoffmann · Ingelheim am Rhein, DE

Key dates

• Filing date: May 31, 1983
• Grant date: Nov 27, 1984
• Expiry date: May 31, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S501/903
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A new phototropic glass in which the phototropic properties arise from precipitations of silver halide and which in the unirradiated condition is slightly tinted or completely colorless while showing a brown color in the light-exposed condition, comprises, in known phototropic glass compositions, an additional content of at least 0.001 wt % of TeO.sub.2 and/or Yb.sub.2 O.sub.3.