Chemically toughened pane
US5773148A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1995 |
| Grant date | Jun 30, 1998 |
| Priority date | — |
| Expiry date | Sep 29, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/315
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This invention has as its subject a panel, preferably produced by the float process, reinforced by surface ion exchange for a long period at a temperature such that the exchanged depth is greater than 250 microns for surface compressive stresses exceeding 400 MPa, and greater than 75 microns for surface compresive stresses exceeding 700 Mpa, and the matrix of which complies with one of the following compositions, expressed in percentages by weight: PA1 SiO.sub.2 :65 to 76% PA1 Al.sub.2 0.sub.3 :1.5 to 5% PA1 MgO:4 to 8% PA1 CaO:0 to 4.5% PA1 Na.sub.2 :10 to 18% PA1 K.sub.2 O:1 to 7.5% PA1 B.sub.2 O.sub.3 :0 to 4% these elements representing at least 96% of the weight of the glass and complying, in addition, with the percentages by weight 0<CaO/CaO+MgO<0.45 and 0.05<K.sub.2 O/Na.sub.2 O+K.sub.2 O<0.35.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.