US 12,168,871 B2
Multi-layer acoustical building panels
Phi-Oanh R. Pham, Lancaster, PA (US); and Sean D. Browne, Lancaster, PA (US)
Assigned to AWI Licensing LLC, Wilmington, DE (US)
Filed by ARMSTRONG WORLD INDUSTRIES, INC., Lancaster, PA (US)
Filed on Nov. 22, 2022, as Appl. No. 17/992,503.
Application 17/992,503 is a continuation of application No. 16/844,285, filed on Apr. 9, 2020, granted, now 11,536,024.
Claims priority of provisional application 62/832,793, filed on Apr. 11, 2019.
Prior Publication US 2023/0084159 A1, Mar. 16, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. E04B 9/04 (2006.01); B32B 5/02 (2006.01); B32B 5/26 (2006.01); B32B 7/12 (2006.01); E04B 1/84 (2006.01); E04B 1/86 (2006.01)
CPC E04B 9/045 (2013.01) [B32B 5/26 (2013.01); B32B 7/12 (2013.01); E04B 1/86 (2013.01); B32B 5/02 (2013.01); B32B 2255/02 (2013.01); B32B 2307/10 (2013.01); B32B 2419/04 (2013.01); E04B 2001/8461 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An acoustic ceiling panel comprising:
a first body comprising a fibrous material and having a first major surface, a second major surface, and a side surface extending between the first and second major surfaces; and
a second body comprising a fibrous material and having a first major surface, a second major surface, and a side surface extending between the first and second major surfaces, the second major surface of the second body facing the second major surface of the first body; and
an attenuation coating comprising: (1) a first portion located between the second major surface of the first body and the second major surface of the second body; and (2) a second portion covering the side surface of the first body;
wherein at least one of the first major surface of the first body and the first major surface of the second body is free from the attenuation coating.