Hard metal watch case with a resistant coating
US4640869A · kind A · utility
41Cited by
3References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 7, 1985 |
| Grant date | Feb 3, 1987 |
| Priority date | — |
| Expiry date | May 7, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12785
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The watch case has its body fashioned of hard metal of hardness preferably greater than 1400 Vickers. The body is overlaid by a two layer coating. The chemical composition of the two layers is identical and comprises the combination of a metal and an element whose atomic number is less than 9. The first layer is deposited by CVD and the second by PVD. If the metal is titanium and the element nitrogen there is obtained on the body of the scratch proof case a perfectly adhering hard coating of gold color.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.