Gemstones and decorative objects comprising a substrate and an optical interference film
US6197428A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 26, 1994 |
| Grant date | Mar 6, 2001 |
| Priority date | — |
| Expiry date | Aug 26, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB44F1/02
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An article useful as a gemstone or decorative object. A formed substrate is used as a base for an optical interference coating applied on the exterior of the substrate. The optical interference coating is made of alternating layers of materials with relatively high refractive indices and relatively low refractive indices, the refractive indices and thicknesses of the alternating layers being chosen so that at least part of the light of wavelengths between 400 nanometers and 700 nanometers incident on the article is reflected. The optical coating creates an interference filter formed of alternating layers of a material with a low refractive index and a material with a high refractive index. The article provides a visual appearance that is novel and different from other gemstones or decorative objects, either man-made or natural.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.