20090223479 is not a patent, just an application. Its Status in the USPTO Public PAIR database is "Abandoned -- Failure to Respond to an Office Action" as of 05-09-2011.
"Clearance volume valves in a heat regenerative engine", application 20070256415, was also abandoned by Cyclone.
The assignment of Cyclone patents to TCA Global Capital was because TCA loaned money to Cyclone and siezed ownership of the patents as collateral.
The lapse of the steam generator patent isn't in Google yet. It is listed in the USPTO Public PAIR database, but that doesn't seem to allow direct links.
6 of 9 of Cyclone's U.S. patents have been allowed to lapse for non-payment of fees. Of course, after all these years Cyclone has never been able to demonstrate any of those inventions worked well enough to justify keeping the patents, either.
As for other patents citing Cyclone patents as prior art, that only means some aspect of their patents is similar to some aspect of Cyclone patents. Usually it means they improved on some weakness of the Cyclone patent.
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