ALEXANDRIA, Va., Nov. 25 -- United States Patent no. 12,480,518, issued on Nov. 25.
"Propeller blade spacer for aquaculture net cleaning" was invented by Peter B. Lindgren (Pompano Beach, Fla.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A propeller assembly to facilitate the cleaning of aquaculture nets. The propeller assembly has a centrally disposed hub with a plurality of plastic composite blades extending outwardly to a perimeter ring. A plurality of triangular shaped rigid knuckles are coupled to the perimeter ring. A blade spacer is attached to a leading edge of each blade, the knuckle and blade spacer are constructed of a wear resistant non-ferrous material, ferrous material, or combination thereof...