ALEXANDRIA, Va., July 28 -- United States Patent no. 12,692,672, issued on July 28, was assigned to Somero Enterprises Inc. (Ft. Myers, Fla.).

"Concrete surface working machine with actuator-controlled rock tamper" was invented by Philip D. Halonen (Calumet, Mich.), Mark A. Pietila (Atlantic Mine, Mich.), James E. Kangas (Calumet, Mich.) and Matthew A. Kangas (Atlantic Mine, Mich.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A concrete surface working machine includes a base portion and a screed head mounted at the base portion. The screed head includes a grade setting device and a vibrating element attached at a frame of the screed head. The screed head includes a rock tamper adjustably attached at the fr...