ALEXANDRIA, Va., July 15 -- United States Patent no. 12,666,643, issued on June 23, was assigned to Allegro MicroSystems LLC (Manchester, N.H.).

"Method to implant p-type and/or n-type rings in a semiconductor device" was invented by Yu-Chun Li (New Taipei City, Taiwan), Thomas S. Chung (Merrimack, N.H.), Maxim Klebanov (Palm Coast, Fla.), Chung C. Kuo (Manchester, N.H.), James M. McClay (Dudley, Mass.) and Robert A. Wilson (Charlton, Mass.).

According to the abstract* released by the U.S. Patent & Trademark Office: "According to one aspect of the present disclosure, a semiconductor device includes a substrate having a first type dopant. In some embodiments, the semiconductor device also includes an epitaxial layer above the substrate, ha...