Organic lens molds in inorganic glass and novel inorganic glasses
AssigneeCorning Incorporated
InventorsPascale Laborde, Daniel L. G. Ricoult
Life of this patent
Estimating the term…
Abstract
The principal object of the present invention is organic lens molds, constituted wholly or in part of at least one specific inorganic glass, advantageously strengthened by a chemical tempering or a thermal tempering. Said glass has the following composition, expressed in percentages by weight: SiO2 56-66, Al2O3 2.5-10, B2O3 0.5-7, Li2O 0-3, Na2O 8-15, K2O 3-12, with Li2O+Na2O+K2O 12-20, ZnO 2-12, MgO 0-3, TiO2 0-0.5, ZrO2 1-9, CaO 0-1, BaO 0-2, SrO 0-2, with MgO+CaO+SrO+BaO 0-5, Cl 0-0.5, As2O3+sb2O3 0-1. The invention also deals with novel inorganic glasses which have the above composition with a single exception relative to the Al2O3 content: Al2O3 2.5-4.
Claims11
Organic lens mold comprising at least one inorganic glass comprising the following composition, expressed in percentages by weight:
- SiO2 56- 66 Al2O3 2.5-10 B2O3 0.5-7 Li2O 0- 3 Na2O 8- 15 K2O 3- 12 with Li2O + Na2O + K2O 12- 20 ZnO 2- 12 MgO 0- 3 TiO2 0- 0.5 ZrO2 1- 9 CaO 0- 1 BaO 0- 2 SrO 0- 2 with MgO + CaO + SrO + BaO 0- 5 Cl 0- 0.5 As2O3 + Sb2O3 0- 1.
Dependencies are inferred from the claim text.