Yes vortech aquarium pump invented a non-submersible motor. Too expensive and did not warranty when they got wet and damaged when they first came out. My invention was right after the vortech propeller pump, by a few weeks.
I am first to invent motor and impeller assembly with magnetic attachment together, and 20 + companies copied and sold my invention. Tunze was first to copy they invented and patented separate magnet holder, motor and impeller. I FILED 2006