External part for a timepiece or a piece of jewellery comprising an interferential colour coating and manufacturing method of said part
US12222531B2 · kind B2 · utility
0Cited by
5References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 12, 2022 |
| Grant date | Feb 11, 2025 |
| Priority date | — |
| Expiry date | Jun 7, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/14
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An external part including a substrate and a coating composed of the following successively superimposed layers; an opaque or semi-opaque reflective layer, configured to have a reflectance of at least 90% for wavelengths including between 600 nm and 780 nm, a transparent or semi-transparent layer, having a refractive index to include between 1.45 and 2.8 for a wavelength of 630 nm, an absorbent layer, the layers giving the coating a predetermined interference colour.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.