US 11,692,351 B2
Solar heat-reflective roofing granules, solar heat-reflective shingles and process for producing the same
Ming Liang Shiao, Collegeville, PA (US); Tihana Tresler, Derry, NH (US); Husnu M. Kalkanoglu, Swarthmore, PA (US); and Walter T. Stephens, Cleveland, OH (US)
Assigned to CERTAINTEED LLC, Malvern, PA (US)
Filed by CertainTeed LLC, Malvern, PA (US)
Filed on Jul. 2, 2021, as Appl. No. 17/366,325.
Application 17/366,325 is a division of application No. 16/394,963, filed on Apr. 25, 2019, granted, now 11,053,684.
Application 14/247,761 is a division of application No. 12/886,721, filed on Sep. 21, 2010, granted, now 8,722,140, issued on May 13, 2014.
Application 16/394,963 is a continuation of application No. 14/247,761, filed on Apr. 8, 2014, abandoned.
Claims priority of provisional application 61/244,627, filed on Sep. 22, 2009.
Prior Publication US 2021/0332590 A1, Oct. 28, 2021
Int. Cl. C03C 10/00 (2006.01); E04D 1/16 (2006.01); E04D 1/20 (2006.01); C04B 33/32 (2006.01); C04B 33/04 (2006.01); C04B 35/10 (2006.01); C04B 35/18 (2006.01); C04B 35/626 (2006.01); C04B 35/636 (2006.01); C04B 35/64 (2006.01); E04D 1/00 (2006.01)
CPC E04D 1/20 (2013.01) [C03C 10/00 (2013.01); C04B 33/04 (2013.01); C04B 33/32 (2013.01); C04B 35/10 (2013.01); C04B 35/18 (2013.01); C04B 35/62695 (2013.01); C04B 35/636 (2013.01); C04B 35/64 (2013.01); E04D 1/16 (2013.01); C04B 2235/3217 (2013.01); C04B 2235/349 (2013.01); C04B 2235/528 (2013.01); C04B 2235/5427 (2013.01); C04B 2235/5436 (2013.01); C04B 2235/5463 (2013.01); C04B 2235/5472 (2013.01); C04B 2235/5481 (2013.01); C04B 2235/95 (2013.01); C04B 2235/9646 (2013.01); C04B 2235/9661 (2013.01); E04D 2001/005 (2013.01); Y02A 30/254 (2018.01); Y02B 80/00 (2013.01); Y10T 428/24413 (2015.01); Y10T 428/24421 (2015.01)] 16 Claims
OG exemplary drawing
 
1. A plurality of roofing granules, each roofing granule comprising a base particle of material thermally stable up to a first temperature of at least 900 C.; and
coated on the base particle, a coating layer of sintered kaolin, sintered bauxite, or a sintered combination of kaolin and bauxite, the coating layer having a crystalline content of at least 90 percent as determined by x-ray diffraction, wherein the crystalline content is the proportion, on a weight basis, of anhydrous crystalline material.