Diffractive indicia for a surface
US5912767A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 12, 1996 |
| Grant date | Jun 15, 1999 |
| Priority date | — |
| Expiry date | Apr 12, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S283/902
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
Diffractive indicia for a surface (1) comprising a plurality of small separate diffractive elements (2) and means for a adhering the diffractive elements to the surface. Each diffractive element has a diffractive surface relief structure and is not separately resolvable to the human eye. The appearance of the diffractive indicia, when applied to the surface, changes when the viewing angle and/or angle of illumination relative to the surface changes. In preferred arrangements, the diffractive indicia, are incorporated in an ink or a transfer medium. A palette of diffractive indicia with different characteristic colours and other optical properties may be provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.