Polarizing, photochromic devices and methods of making the same
US7471436B2 · kind B2 · utility
2Cited by
112References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 31, 2006 |
| Grant date | Dec 30, 2008 |
| Priority date | — |
| Expiry date | Oct 31, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24934
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A security element connected to at least a portion of a substrate, the security element including an at least partial coating having a first state and a second state connected to at least a portion of the substrate, the at least partial coating being adapted to switch from a first state to a second state in response to at least actinic radiation, to revert back to the first state in response to thermal energy, and to linearly polarize at least transmitted radiation in at least one of the first state and the second state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.