Lens Envelope Patents (Class 65/DIG1)
  • Body of cerium-doped quartz glass
    Patent number: 5236876
    Abstract: A body of cerium-doped quartz glass is manufactured by melting together silicon oxide and a cerium (III) silicate compound, preferably Ce.sub.2 Si.sub.2 O.sub.7, in a reducing atmosphere. The invention provides a method of manufacturing said cerium-silicate compound having a tetragonal crystal structure. The quartz glass manufactured can be suitably used in a lamp envelope of UV-absorbing quartz glass, the water content in the quartz glass being less than 1 ppm.
    Type: Grant
    Filed: July 24, 1991
    Date of Patent: August 17, 1993
    Assignee: U.S. Philips Corporation
    Inventors: Henricus A. M. Van Hal, Renatus Aerts, Emmanuel Papanikolau
  • Bulb forming orifice plate for bulb making apparatus
    Patent number: 5162055
    Abstract: An orifice plate for a glass ribbon machine has an orifice provided with a side wall having a continuously variable angle. When used for making envelopes for incandescent lamps, the plate provides stronger bulbs.
    Type: Grant
    Filed: May 6, 1992
    Date of Patent: November 10, 1992
    Assignee: GTE Products Corporation
    Inventor: William H. Anderson