ALEXANDRIA, Va., March 31 -- United States Patent no. 12,590,779, issued on March 31, was assigned to The Government of the United States of America, as represented by the Secretary of the Navy (Arlington, Va.).

"Stead-field coilgun methods and devices" was invented by Emil Paskalev Kartalov (Pacific Grove, Calif.) and Jeffrey Kyle Catterlin (Salinas, Canada).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for operating an electromagnetic coilgun system, the method comprising: an electromagnetic coilgun comprising: a barrel and a longitudinally extended electrical excitation coil; wherein the electrical excitation coil circumferentially surrounds a bore of the barrel, energizing the electrical excitat...