The Cyclone patent was "Cited by examiner", i.e., U.S. Patent Office examiner, not Raytheon.
The lead inventor is Kevin Bowen. He was an Engineering Fellow for Advanced Technology at Raytheon Integrated Defense Systems, and the sponsor of the submersible project at Raytheon. Here is him explaining his dream at Cyclone in December 2011: https://vimeo.com/34571193
His dream of a long range submersible required a small steam engine. Cyclone's engine was the only steam engine design that potentially could fit this application. So Raytheon went to Cyclone.
Note the patent application was filed July 19, 2012, but Raytheon only got their engines in June of 2012. The patent was written long before Raytheon had any results from their Cyclone engines.
But it doesn't matter much, because the project sponsor at Raytheon, Kevin Bowen, retired in June 2013. His project retired with him. Raytheon never went back to Cyclone.
There is also a misconception that a patent means the device actually works. This is not true. The Patent Office does not evaluate the technical effectiveness of an invention, except when the inventon claims to be cold fusion or a perpetual motion machine (although many of these do get patents anyway). The device only has to show it would be useful if it works the way the inventor describes it to work. Harry Schoell described the Cyclone engine as producing power from fuel, and if it actually does what he says it would be useful. That qualified it for the patent.
The fact is, though, the main Cyclone patent US7080512 "Heat regenerative engine" was filed September 13, 2005, and Cyclone has yet to demonstrate one powering anything.
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