ALEXANDRIA, Va., Nov. 6 -- United States Patent no. 12,459,861, issued on Nov. 4, was assigned to Cemgreen APS (Roskilde, Denmark).
"Device for producing supplementary cementitious material" was invented by Lasse Norbye Dossing (Roskilde, Denmark), Martin Hagsted Rasmussen (Lubeck, Denmark) and Mogens Juhl Fons (Hadsund, Denmark).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a device for heat-treating solid material, in particular in granular form, wherein the device comprises a kiln and an external heat generator, wherein said kiln comprises at least one sloped sliding surface on which a bed of said solid material slides down within said kiln due to gravity while a hot gas g...