US 7,518,314 B2
Red-colored electric lamp
Maarten Walter Steinmann, Turnhout (Belgium); Hubertina Maria Ulenaers, Eindhoven (Netherlands); Simon Krijnen, Eindhoven (Netherlands); and Simon Flink, Eindhoven (Netherlands)
Assigned to Koninklijke Philips Electronics N.V., Eindhoven (Netherlands)
Appl. No. 10/533,727
PCT Filed Oct. 16, 2003, PCT No. PCT/IB03/04580
§ 371(c)(1), (2), (4) Date May 03, 2005,
PCT Pub. No. WO2004/041739, PCT Pub. Date May 21, 2004.
Claims priority of application No. 02292767 (EP), filed on Nov. 06, 2002.
Prior Publication US 2006/0033440 A1, Feb. 16, 2006
Int. Cl. H01J 17/16 (2006.01)
U.S. Cl. 313—636  [501/32; 501/55] 6 Claims
OG exemplary drawing
 
1. An electric automotive signal lamp having a glass envelope, the glass being red colored, the glass composition comprising copper between 0.1 and 2% by weight, tin between 0.1 and 2% by weight, barium between 7 and 11% by weight, and strontium between 1 and 5% by weight, wherein the glass composition, expressed in percents by weight of the oxidic forms of the constituents, comprises:
   
  SiO2 60-72
  Al2O3 1-5
  Li2O 0.5-1.5
  Na2O 5-9
  K2O 3-7
  MgO 1-2
  CaO 1-3
  SrO  1-5.