Referenced by|
| US4372256 | 14 May 1981 | 8 Feb 1983 | | Char burning free piston gas generator | | US4876991 | 8 Dec 1988 | 31 Oct 1989 | | Two stroke cycle engine | | US4924956 | 9 Feb 1988 | 15 May 1990 | RDG Inventions Corporation | Free-piston engine without compressor | | US6199519 | 25 Jun 1998 | 13 Mar 2001 | Sandia Corporation | Free-piston engine | | US6945202 | 1 Nov 2004 | 20 Sep 2005 | Denso Corporation | Free piston engine and power generation system therewith |
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