ALEXANDRIA, Va., Dec. 2 -- United States Patent no. 12,486,377, issued on Dec. 2.
"Building material" was invented by Joel T. Charlton (Alpharetta, Ga.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A building material consists essentially of 65% by weight to 75% by weight calcium carbonate, wherein the calcium carbonate has a particle size distribution having a first mode having a median particle diameter from 10 micrometers to 25 micrometers and a second mode having median particle diameter from 40 micrometers to 80 micrometers; 25% by weight to 35% by weight polyurethane form by reaction of (i) one or more isocyanates selected from the group consisting of diisocyanates, polyisocyanates and mixtures thereo...