High pressure discharge lamp

US6639362B1 · kind B1 · utility

Assignee

• General Electric Company · US

Inventors

• Curtis E. Scott · Mentor, US
• Jack M. Strok · Garrettsville, US
• Charles D. Greskovich · Schenectady, US

Key dates

• Filing date: Nov 6, 2000
• Grant date: Oct 28, 2003
• Expiry date: Jun 5, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2235/72
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

An arc discharge vessel having electrodes disposed therein, a fill within the discharge vessel wherein the arc discharge vessel is comprised of alumina including the following dopants in parts per million: 50≦MgO≦1500; 100≦HFO2 ≦1500; 0≦ZrO2≦700; 0≦Y2O3≦300; 0≦Sc2O3≦1000; 0≦Dy2O3≦1000; 0≦Tb2O3≦1000; with the proviso that at least 5 ppm Y2O3, Sc2O3, Dy2O3, Tb2O3, or mixtures thereof is included.