Glasses exhibiting low thermal coefficients of elasticity
US4855260A · kind A · utility
5Cited by
2References
1Claims
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Key dates
| Filing date | Jul 8, 1988 |
| Grant date | Aug 8, 1989 |
| Priority date | — |
| Expiry date | Jul 8, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C3/091
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Glasses exhibiting low thermal coefficients of elastic modulus, good glass stability, low thermal expansion, and good chemical durability are provided, a first glass type including glasses consisting essentially, in weight percent on the oxide basis, of about 60-64% SiO.sub.2, 14-18% B.sub.2 O.sub.3, 8.5-10% Al.sub.2 O.sub.3, 4-7% Na.sub.2 O, and 2-12% BaO, and a second group comprising alkali silicate glasses consisting essentially, in weight percent on the oxide basis, of about 51-55% SiO.sub.2, 10-13% K.sub.2 O, 5-15% ZnO, 5-15 BaO, and 10-20% PbO.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.