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| 9689344 | Double-acting modular free-piston stirling machines without buffer spaces | Jan 02, 14 | Jun 27, 17 | Not available |
| 9683514 | High efficiency combustor and closed-cycle heat engine interface | Mar 16, 12 | Jun 20, 17 | THE PENN STATE RESEARCH FOUNDATION, The United States of America as represented by the Secretary of the Navy, |
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| 9488259 | Actuator and method of actuating | Dec 18, 09 | Nov 08, 16 | BAKER HUGHES INCORPORATED |
| 9435291 | Energy transfer machines | Jun 16, 10 | Sep 06, 16 | COLD POWER SYSTEMS INC. |
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