Silica-free, alkali metal-free and lead-free sealing glasses
US3970464A · kind A · utility
3Cited by
4References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 10, 1975 |
| Grant date | Jul 20, 1976 |
| Priority date | — |
| Expiry date | Feb 10, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C8/24
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Zinc borate sealing glasses free of silica, alkali metal oxide and lead are disclosed for use in sealing and encapsulation, particularly in connection with semi-conductor devices and electronic components which are sensitive to alkali metal and lead. The glasses have coefficients of thermal expansion in the range of about 35 to 55 .times. 10.sup..sup.-7 /.degree.C, fiber softening temperatures in the range of about 600.degree. to 675.degree.C and annealing point temperatures in the range of about 500 to 580.degree.C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.