The patent is https://www.google.com/patents/US20110201238. Would that patent preclude any sort of electric motor with a jet drive system from being created for stand-up paddle boards? It mentions "similar small watercraft". Well, a paddle board isn't a watercraft, nor is a surfboard. Does this intentionally vague wording end up hurting their case against future "inventors" who happen to create a similar product?
Claim 1. A powered small watercraft, comprising: a battery pack with seated terminals and casing preventing current leakage into ambient water; a water-jet pump powered by the battery pack; an electronic control unit powered by the battery pack and controlling the water-jet pump, comprising a wireless receiver, a programmable motor controller, an information storage element with instructions for nuanced control of the water-jet pump, a microprocessor interpreting signals received by the wireless receiver, reading the instructions on the information storage element, and issuing commands to the motor controller according to the instructions being read. a body assembly comprising a body of a size and shape similar to a conventional unpowered version of the watercraft, modified with cavities and channels fitting the battery pack, the water-jet pump, the electronic control unit, and associated electrical connections, and a plurality of covers configured to confine and protect the battery pack, the water-jet pump, the electronic control unit, and the associated electrical connections inside the cavities and channels, where the cavities are configured to distribute the weight of intended contents so that the drag coefficient, balance, and center of gravity of the powered watercraft resembles those of a conventional unpowered version of the watercraft, and when fully assembled, the shape of the powered watercraft substantially resembles that of a conventional unpowered version of the watercraft; and further comprising: a wireless controller comprising a switch, a wireless transmitter controlled by the switch, and a waterproof support structure supporting the switch and the wireless transmitter, where the wireless transmitter communicates with the wireless receiver in the electronic control unit, and the support structure positions the switch to be operable without disrupting an operator's normal postures and gestures conventionally associated with piloting the watercraft.