US 7,560,402 B2
Clear glass composition
Scott V. Thomsen, South Lyon, Mich. (US); Ksenia A. Landa, Brownstown, Mich. (US); Leonid M. Landa, legal representative; and Richard Hulme, Rochester Hills, Mich. (US)
Assigned to Guardian Industries Corp., Auburn Hills, Mich. (US)
Filed on Oct. 06, 2006, as Appl. No. 11/543,999.
Prior Publication US 2008/0085827 A1, Apr. 10, 2008
Int. Cl. C03C 3/095 (2006.01); C03C 3/087 (2006.01)
U.S. Cl. 501—64  [501/70; 501/71] 20 Claims
 
1. Glass comprising:
   
  Ingredient wt. %
   
  SiO2 67-75%
  Na2O 10-20%
  CaO  5-15%
  total iron (expressed as Fe2O3) 0.0005 to 0.20%
  erbium oxide 0.0001 to 0.20%
  zinc oxide  0.01 to 3%
   
wherein the glass has visible transmission of at least 85%, a transmissive a* color value of from −0.20 to +0.15, and a transmissive b* color value of −0.15 to +0.20.