ALEXANDRIA, Va., July 16 -- United States Patent no. 12,357,425, issued on July 15, was assigned to GEBR. BRASSELER GMBH & Co. KG (Lemgo, Germany).
"Dental root canal instrument" was invented by Omer Cakir (Lemgo, Germany) and Ernst Abrams (Lemgo, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to a dental root canal instrument including a shaft region and a cutting region having cutting edges and a core, wherein an envelope curve of the cutting edges of the cutting region conically expands from a tip towards the shaft region with a first slope at a first angle, and wherein the core of the cutting edge region increases towards the shaft region with a second slope at a second angl...