ALEXANDRIA, Va., Dec. 23 -- United States Patent no. 12,502,756, issued on Dec. 23, was assigned to Black & Decker Inc. (New Britain, Conn.).

"High inertia driver system" was invented by Stuart E. Garber (Towson, Md.), Paul G. Gross (White Marsh, Md.) and Marco A. Mattucci (Baltimore).

According to the abstract* released by the U.S. Patent & Trademark Office: "A high inertia driver system for a fastening tool having an electric motor that drives a flywheel to contact a driver blade to drive a fastener into a workpiece. The high inertia driver system also has a return system which prevents the unintentional driving of a second fastener. The return system uses a return spring that controls the recoil energy of the driver blade after driving...