ALEXANDRIA, Va., Sept. 30 -- United States Patent no. 12,426,988, issued on Sept. 30.

"Three-dimensional orthodontic retainer and method for making a three-dimensional orthodontic retainer" was invented by Juerg Hostettler (Huttwil, Switzerland) and Jonas Hostettler (Huttwil, Switzerland).

According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to a three-dimensional orthodontic retainer (2) and to a method for producing such a retainer (2) in which the three-dimensional orthodontic retainer (2) is matched to the exact shape of the adjacent teeth (3) and is produced from a blank (1) in such a manner that the physical properties of the material of the remaining part of the blank (1) are unchanged i...