ALEXANDRIA, Va., March 17 -- United States Patent no. 12,575,909, issued on March 17, was assigned to GEBR. BRASSELER GMBH & Co. KG (Lemgo, Germany).
"Root canal instrument" was invented by Michael Krumsiek (Lemgo, Germany) and Michael Kullmer (Lemgo, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to a root canal instrument having a shank and a working area attached to the shank, wherein the working area consists of a nickel-titanium alloy comprising 38 to 46 at % nickel, 46 to 53 at % titanium and 5.5 to 8.8 at % copper. The invention relates to a root canal instrument having a shank and a working area attached to the shank, wherein the working area consists of a nickel-titaniu...