Transparent and scratchproof watch crystal and watch case fitted with such a crystal
US6111821A · kind A · utility
37Cited by
4References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 14, 1998 |
| Grant date | Aug 29, 2000 |
| Priority date | — |
| Expiry date | Jan 14, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04B39/006
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A transparent and scratchproof watch crystal, characterized in that it is made of polycrystalline diamond. The invention also concerns a watch case fitted with such a watch crystal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.