US 12,122,140 B2
LED lighting unit with multi-layer bodies having a carrier layer, a stone layer, and an edgelit transparent layer
Torsten Thust, Wermelskirchen (DE); Thorsten Schulz, Leverkusen (DE); Rainer Hagen, Leverkusen (DE); Ciro Piermatteo, Leverkusen (DE); Marius Rogowski, Frechen (DE); Armin Berger, Langenfeld (DE); and Jan Helmig, Dormagen (DE)
Assigned to Covestro Intellectual Property GmbH & Co. KG, Leverkusen (DE)
Appl. No. 17/642,999
Filed by Covestro Intellectual Property GmbH & Co. KG, Leverkusen (DE)
PCT Filed Sep. 21, 2020, PCT No. PCT/EP2020/076247
§ 371(c)(1), (2) Date Mar. 15, 2022,
PCT Pub. No. WO2021/063719, PCT Pub. Date Apr. 8, 2021.
Claims priority of application No. 19200453 (EP), filed on Sep. 30, 2019; and application No. 20 2020 101 945.7 (DE), filed on Apr. 8, 2020.
Prior Publication US 2022/0332089 A1, Oct. 20, 2022
Int. Cl. B32B 9/04 (2006.01); B32B 1/00 (2006.01); B32B 7/023 (2019.01); B32B 9/00 (2006.01); B32B 27/20 (2006.01); B32B 27/36 (2006.01); F21V 8/00 (2006.01); F21V 33/00 (2006.01); F21Y 113/17 (2016.01); F21Y 115/10 (2016.01)
CPC B32B 9/045 (2013.01) [B32B 1/00 (2013.01); B32B 7/023 (2019.01); B32B 9/002 (2013.01); B32B 27/20 (2013.01); B32B 27/365 (2013.01); F21V 33/00 (2013.01); G02B 6/0051 (2013.01); G02B 6/0065 (2013.01); B32B 2255/10 (2013.01); B32B 2255/26 (2013.01); B32B 2255/28 (2013.01); B32B 2264/02 (2013.01); B32B 2264/108 (2013.01); B32B 2264/12 (2013.01); B32B 2307/3065 (2013.01); B32B 2307/4026 (2013.01); B32B 2307/412 (2013.01); B32B 2307/414 (2013.01); B32B 2307/538 (2013.01); B32B 2307/732 (2013.01); B32B 2419/04 (2013.01); B32B 2457/00 (2013.01); B32B 2479/00 (2013.01); B32B 2509/00 (2013.01); B32B 2605/003 (2013.01); B32B 2607/02 (2013.01); F21Y 2113/17 (2016.08); F21Y 2115/10 (2016.08)] 18 Claims
OG exemplary drawing
 
1. A lighting unit comprising:
a multilayer body including:
a carrier layer of a black or gray colored translucent thermoplastic material,
a stone layer having an average thickness of ≤2 mm over its total area,
a transparent layer of a thermoplastic material and having an average thickness 1 mm to 6 mm over its total area; and
a first LED light source, arranged at least one lateral edge of the transparent layer, and configured to project light into the transparent layer, such that light is projected out of a surface of the transparent layer facing away from the stone layer.