US 12,436,323 B2
Retroreflective traffic sign and process and apparatus for manufacturing same
Robert M. Pricone, Libertyville, IL (US)
Assigned to The Boeing Company, Arlington, VA (US)
Filed by The Boeing Company, Arlington, VA (US)
Filed on Dec. 20, 2023, as Appl. No. 18/390,903.
Application 18/390,903 is a continuation of application No. 18/084,620, filed on Dec. 20, 2022, granted, now 11,921,305.
Application 18/084,620 is a continuation of application No. 17/940,404, filed on Sep. 8, 2022, granted, now 11,567,246, issued on Jan. 31, 2023.
Claims priority of provisional application 63/257,431, filed on Oct. 19, 2021.
Claims priority of provisional application 63/242,928, filed on Sep. 10, 2021.
Prior Publication US 2024/0118465 A1, Apr. 11, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G02B 5/124 (2006.01)
CPC G02B 5/124 (2013.01) 20 Claims
OG exemplary drawing
 
1. A retroreflective layered structure comprising:
a substrate;
cell walls extending from the substrate at a first end of the cell walls to define cells, the cell walls including a second end opposite the first end;
a polymeric sheet directly coupled to the cell walls at the second end, the cell walls formed of a two-part polyurea adhesive; and
the polymeric sheet including a retroreflective pattern, the retroreflective pattern separated from the substrate via an air gap.