Method of making an optically readable element
US11347987B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 2019 |
| Grant date | May 31, 2022 |
| Priority date | — |
| Expiry date | Feb 6, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V20/95
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
According to a first aspect of the present invention, there is provided a method of making an optically readable element, the method comprising: providing one or more optically readable structures in or on a body, a strain being applied to the one or more optically readable structures as a result of an interaction between the body and the one or more optically readable structures; the one or more optically readable structures each having an intrinsic band structure prior to application of the strain, and wherein the applied strain changes that intrinsic band structure; and wherein the interaction is such that the strain is maintained, after the element has been made, without the need for an external influence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.