ALEXANDRIA, Va., June 19 -- United States Patent no. 12,330,776, issued on June 17, was assigned to Lockheed Martin Corp. (Bethesda, Md.).

"Tunable mass damper assembly for a rotor blade" was invented by John C. Cox (Jupiter, Fla.), Steven P. Lozano (Stratford, Conn.), David H. Hunter (Stratford, Conn.), Emmett Emile Menair (Stratford, Conn.), Jacob Adam Fehrman (Stratford, Conn.) and John Devin Carroll (Fortworth, Texas).

According to the abstract* released by the U.S. Patent & Trademark Office: "A tunable mass damper assembly is attachable to a rotor blade. The tunable mass damper assembly comprises a base configured to be attached to the rotor blade and a pendulum mass structure movably attached to the base and configured to move relat...