Photonic structure for dynamic expression of colors and effects
US12311040B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 2021 |
| Grant date | May 27, 2025 |
| Priority date | — |
| Expiry date | Apr 14, 2042 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K2800/81
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Photochromic formulations including a core material and a photochromic layer overlying the core material and forming a particle are provided. The photochromic layer may include a plurality of photochromic materials, including a first photo-responsive pigment characterized by reversible diffuse reflectance at a first central wavelength from 490 nm to 520 nm in response to irradiation by photons of a first characteristic wavelength, a second photo-responsive pigment characterized by reversible diffuse reflectance at a second central wavelength from 570 nm to 590 nm in response to irradiation by photons of a second characteristic wavelength, and a third photo-responsive pigment characterized by reversible diffuse reflectance at a third central wavelength from 450 nm to 495 nm and a fourth central wavelength from 625 nm to 740 nm in response to irradiation by photons of a third characteristic wavelength. The first, second, and third characteristic wavelengths may be different.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.