When reading the wikipedia page I was surprised to learn that: "In 1997, Airtrax Incorporated and several other companies each paid the US Navy $2,500 for rights to the technology, including old drawings of how the motors and controllers worked, to build an omnidirectional forklift truck"

This was more than 20 years ago, but $2,500 seems on the low end for a usage-license. This patent is pretty interesting after all. Does anyone have any knowledge in this area? Is that average for these types of patents, or is the Navy giving it away for cheap to incentivize new innovation?