Non-alkali glass
US9902645B2 · kind B2 · utility
3Cited by
4References
18Claims
0Family size
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Key dates
| Filing date | Apr 18, 2017 |
| Grant date | Feb 27, 2018 |
| Priority date | — |
| Expiry date | Apr 18, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2202/09
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Provided is a non-alkali glass having a strain point of 680° C. or higher, having an average thermal expansion coefficient of from 30×10−7/° C. to 45×10−7/° C. at from 50° C. to 350° C., containing, indicated by mass % on the basis of oxides: SiO2: 54% to 66%, Al2O3: 10% to 27%, B2O3: 0.2% to 5.5%, MgO: 0% to 10%, CaO: 0% to 15%, SrO: 0% to 15%, BaO: 0% to 15%, and MgO+CaO+SrO+BaO: 8% to 25%, containing 600 mass ppm or less of Na2O, and satisfying a mass ratio (Na2O/B2O3) between Na2O and B2O3 being from 0.001 to 0.3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.