Durable retroreflective elements with an ionic copolymer core
US11353640B2 · kind B2 · utility
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28References
8Claims
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Key dates
| Filing date | Sep 6, 2016 |
| Grant date | Jun 7, 2022 |
| Priority date | — |
| Expiry date | Apr 10, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/136
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The disclosed retroreflective element includes a highly durable core with an ionic copolymer and a plurality of beads. These disclosed retroreflective properties remain intact even after continued application of external forces and stresses. Further, the ionic copolymer allows for beads to be loaded into the ionic copolymer of the core, securely disposed around the perimeter of the core, or both.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.