Alkali-free glasses
US4012263A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 10, 1975 |
| Grant date | Mar 15, 1977 |
| Priority date | — |
| Expiry date | Feb 10, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/0002
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Glass compositions, free of alkali metal, are disclosed which are suitable for a wide variety of purposes, particularly in the electronics industry. The glasses have good working properties and resist uncontrolled devitrification. Characterized by low to moderate thermal expansion properties, the glass compositions generally contain the following components expressed as oxides in the indicated amounts based on the total weight of the composition: ______________________________________ SiO.sub.2 50-62 Al.sub.2 O.sub.3 8-15 ______________________________________ and at least one RO oxide as follows: ______________________________________ CaO 0-25 BaO 15.5-32 MgO 0-2.4 ______________________________________ and wherein the sum of the RO oxides is at least 23%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.