ALEXANDRIA, Va., Jan. 13 -- United States Patent no. 12,525,366, issued on Jan. 13, was assigned to Last Energy Inc. (Washington).

"Nuclear reactor system and metallic coolant composition" was invented by Bret Kugelmass (Washington), Mark Blomstrom (Northbridge, Mass.), Charles Cole (Washington), Phoebe Lind (Washington) and Daniel Theobald (Washington).

According to the abstract* released by the U.S. Patent & Trademark Office: "One variation of a system includes: a nuclear reactor; a shield arranged about the nuclear reactor; a metallic coolant; and a set of melt seals. The nuclear reactor includes a pressure vessel and nuclear fuel arranged within a lower region of the pressure vessel. The metallic coolant includes a mixture of metals a...