US 11,940,651 B2
Ultraviolet C light guides
Timothy J. Hebrink, Scandia, MN (US); Stephen P. Maki, North St. Paul, MN (US); Michael E. Griffin, Maplewood, MN (US); Anna C. Hamlin, Lino Lakes, MN (US); Justin M. Mazzoni, Cheshire, CT (US); Christopher A. Merton, St. Louis Park, MN (US); and Matthew T. Scholz, Woodbury, MN (US)
Assigned to 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
Appl. No. 17/309,683
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Dec. 23, 2019, PCT No. PCT/IB2019/061296
§ 371(c)(1), (2) Date Jun. 15, 2021,
PCT Pub. No. WO2020/136557, PCT Pub. Date Jul. 2, 2020.
Claims priority of provisional application 62/785,031, filed on Dec. 26, 2018.
Prior Publication US 2022/0026633 A1, Jan. 27, 2022
Int. Cl. G02B 6/10 (2006.01); A61L 2/10 (2006.01); A61L 2/26 (2006.01); C02F 1/32 (2023.01)
CPC G02B 6/102 (2013.01) [A61L 2/10 (2013.01); A61L 2/26 (2013.01); C02F 1/32 (2013.01); C02F 2201/3228 (2013.01); C02F 2303/04 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A light guide comprising
(A) a polymeric layer at least 25 percent transmissive over at least 30 nm bandwidth in a wavelength range from 180 to 280 nanometers over at least a distance of 100 micrometers and
(B) a plurality of visible light transparent UV-C reflecting layers that is
(i) at least 50 percent reflective over at least 30 nanometers in a wavelength range from 180 to 280 nanometers over an incident light angle of 0 to 90 degrees and (ii) at least 25 percent transmissive of visible light over at least 30 nm in a wavelength range of 400 to 800 nm over an incident light angle of 0 to 90 degrees,
wherein each visible light transparent UV-C reflecting layer is a dielectric mirror comprising a first optical layer and an adjacent second optical layer.