ALEXANDRIA, Va., Nov. 6 -- United States Patent no. 12,458,569, issued on Nov. 4, was assigned to KULZER GMBH (Hanau, Germany).
"Retraction paste and container comprising the retraction paste" was invented by Andreas Grundler (Munzenberg, Germany), Martin Grunwald (Pulheim, Germany) and Peter Deutzmann (Rommerskirche, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to a retraction paste comprising a composition of i) 10 to 25% by weight at least one astringent compound, ii) 50 to 75% by weight fillers, iii) 10 to 35% by weight protic liquid, and iv) 0 to 10% by weight pigments, dye and/or rheology additive, ii) the fillers comprising kaolinite and mica in the ratio of 4:1 to 1.5:...