ALEXANDRIA, Va., March 19 -- United States Patent no. 12,250,930, issued on March 18.
"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 aluminum alloy blades extending outwardly to a perimeter ring. A plurality of triangular shaped rigid knuckles is coupled to the perimeter ring. A blade spacer is attached to a leading edge of each blade, the blade spacer constructed of a wear resistant material. In operation, rotation of the blades provides thrust for positioning t...