Watch cover glass and process for the manufacture of such a glass
US4849299A · kind A · utility
32Cited by
0References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 11, 1987 |
| Grant date | Jul 18, 1989 |
| Priority date | — |
| Expiry date | Dec 11, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC30B33/00
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Sapphire watch cover glass or crystal. The glass or crystal (18) comprises on a part of its upper face, a superficial layer (28) having an amorphous structure. This layer (28) makes it possible to increase the hardness of the glass or crystal in its exposed parts while reducing the risk of breakage of said glass or crystal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.