Colorless inorganic glass
US6420290B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 2000 |
| Grant date | Jul 16, 2002 |
| Priority date | — |
| Expiry date | Feb 11, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S501/905
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The object of the present invention is colorless inorganic glasses, as well as products manufactured from said glasses. Said glasses are of the type containing copper halides or copper cadmium halides and having a sharp optical absorption cutoff between 370 nm and 425 nmessentially having the composition below, expressed in cationic percentages:23-73%SiO215-45%B2O3 0-24%Al2O3 0-12%Li2O 0-20%Na2O 0-12%K2O0-5%CaO + BaO + SrO0.125-1%   Cu2O0-1%CdO0-5%ZrO2 with   0-1.75% Cl 0.25-2% Cl + Br 0-2% Brand0-2%F;the Cl, Br and F contents being themselves expressed in percentages by weight of the total composition;with an adequate amount of reducing agent(s) which is (are) advantageously selected from SnO2, As2O3, Sb2O3 , and mixtures thereof, in order to have mainly, in said glasses, the copper in the form of cuprous ions (Cu+), and therefore glasses which have neither a red coloration, nor a blue green coloration;and the residual yellow coloration of which is minimized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.