US 12,303,935 B2
Indicator for the sanding of joint compounds and spackles
Alexander J. Donovan, Lake Forest, IL (US); Joseph W. Schlude, Vernon Hills, IL (US); and Tyler Kincaid, Chicago, IL (US)
Assigned to UNITED STATES GYPSUM COMPANY, Chicago, IL (US)
Filed by United States Gypsum Company, Chicago, IL (US)
Filed on Oct. 24, 2019, as Appl. No. 16/662,648.
Claims priority of provisional application 62/768,559, filed on Nov. 16, 2018.
Prior Publication US 2020/0156999 A1, May 21, 2020
Int. Cl. E21B 43/34 (2006.01); B05D 3/00 (2006.01); C04B 26/02 (2006.01); C04B 103/54 (2006.01); C04B 111/00 (2006.01); C04B 111/54 (2006.01)
CPC B05D 3/007 (2013.01) [C04B 26/02 (2013.01); C04B 2103/54 (2013.01); C04B 2111/00663 (2013.01); C04B 2111/00689 (2013.01); C04B 2111/54 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A joint compound or a spackling compound comprising: one or more fillers, one or more binders and a sanding indicator comprising murexide, cresol red, m-cresol purple, bromoxylenol, thymol blue, or any combination thereof, and wherein the joint compound or spackling compound displays a first color at the air/joint compound surface after the joint compound or the spackling compound has dried or hardened, wherein the first color is distinguishable from a second color of the joint compound beneath the air/joint compound surface.