US 12,276,434 B2
Fixed plug for use in a process of forming an insulated register box
Sterling Kidd Combs, Magnolia, TX (US)
Filed by STERLING CUSTOM SHEET METAL, INC., Magnolia, TX (US)
Filed on Mar. 9, 2021, as Appl. No. 17/196,678.
Application 15/864,612 is a division of application No. 14/668,079, filed on Mar. 25, 2015, granted, now 9,951,969, issued on Apr. 24, 2018.
Application 17/196,678 is a continuation in part of application No. 17/175,956, filed on Feb. 15, 2021, granted, now 12,104,820.
Application 17/175,956 is a continuation in part of application No. 17/175,922, filed on Feb. 15, 2021, granted, now 12,000,613.
Application 17/175,922 is a continuation in part of application No. 17/171,638, filed on Feb. 9, 2021, granted, now 12,083,716.
Application 17/171,638 is a continuation in part of application No. 16/036,059, filed on Jul. 16, 2018, granted, now 11,060,756.
Application 16/036,059 is a continuation in part of application No. 16/005,235, filed on Jun. 11, 2018, granted, now 11,402,121.
Application 16/036,059 is a continuation in part of application No. 15/864,612, filed on Jan. 8, 2018, granted, now 10,995,969.
Application 16/005,235 is a continuation in part of application No. 15/703,436, filed on Sep. 13, 2017, granted, now 10,648,695, issued on May 12, 2020.
Application 15/703,436 is a continuation in part of application No. 15/439,454, filed on Feb. 22, 2017, granted, now 10,309,682, issued on Jun. 4, 2019.
Application 15/439,454 is a continuation in part of application No. 14/668,079, filed on Mar. 25, 2015, granted, now 9,951,969, issued on Apr. 24, 2018.
Prior Publication US 2021/0262693 A1, Aug. 26, 2021
Int. Cl. B29C 44/18 (2006.01); B29C 41/20 (2006.01); B29C 44/36 (2006.01); B29K 75/00 (2006.01); B29K 105/00 (2006.01); F24F 13/06 (2006.01); F24F 13/08 (2006.01)
CPC F24F 13/082 (2013.01) [B29C 41/20 (2013.01); B29C 44/18 (2013.01); F24F 13/06 (2013.01); B29C 44/36 (2013.01); B29K 2075/00 (2013.01); B29K 2105/0058 (2013.01); B29K 2995/0015 (2013.01); Y10T 29/49158 (2015.01); Y10T 428/233 (2015.01)] 14 Claims
OG exemplary drawing
 
1. A plug apparatus for sealing an interior of a duct in a process for forming an insulated register box, the plug apparatus comprising:
a frame;
a shaft extending outwardly of said frame, said shaft having a cap at an end opposite said frame;
a plurality of layers of flexible material radiating outwardly of said shaft adjacent to an end of said shaft opposite said frame, said plurality of layers of flexible material adapted to have an outer periphery bearing against an interior surface of the duct;
a washer positioned on said shaft and interposed between the cap and said plurality of layers of flexible material, said washer being rigid, said washer having a diameter less than an outer diameter of said plurality of layers of flexible material; and
a fastener affixed to said shaft on a side of said plurality of layers of flexible material opposite said washer, said fastener having a surface bearing against said plurality of layers of flexible material, said fastener having a diameter less than the outer diameter of said plurality of layers of flexible material.