US 12,008,924 B2
Method of attaching a diffuser to an illuminated sign
Robert John Riffel, Saltillo, MS (US); and Gary Lauderdale, Shannon, MS (US)
Assigned to SIGNIFY HOLDING, B.V., Eindhoven (NL)
Appl. No. 17/617,919
Filed by SIGNIFY HOLDING B.V., Eindhoven (NL)
PCT Filed Jun. 10, 2020, PCT No. PCT/EP2020/066025
§ 371(c)(1), (2) Date Dec. 9, 2021,
PCT Pub. No. WO2020/249586, PCT Pub. Date Dec. 17, 2020.
Claims priority of provisional application 62/860,006, filed on Jun. 11, 2019.
Claims priority of application No. 19184360 (EP), filed on Jul. 4, 2019.
Prior Publication US 2022/0309966 A1, Sep. 29, 2022
Int. Cl. G09F 13/04 (2006.01)
CPC G09F 13/0409 (2013.01) [G09F 13/0458 (2021.05); G09F 2013/05 (2021.05)] 11 Claims
OG exemplary drawing
 
1. An illumination sign having an interior, an internal light source and a face panel having an interior side, the illumination sign comprising:
a stencil defining openings that form a symbol or letters viewable by an observer;
a diffuser holder attached to the interior side of the face panel and juxtaposed to the stencil, wherein in use a diffuser sheet is attached to and held tightly against the diffuser holder
wherein the diffuser holder comprises opposed channels for permitting the diffuser sheet to be inserted and thereby securely held against the diffuser holder, and wherein the diffuser holder is made of a clear material that creates a barrier that prevents foreign objects from being inserted through the stencil openings and into the illumination sign interior.