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| 9856791 | Wave disc engine apparatus | Aug 19, 13 | Jan 02, 18 | BOARD OF TRUSTEES OF MICHIGAN STATE UNIVERSITY |
| 9708921 | Impeller with sealing portion | Nov 20, 13 | Jul 18, 17 | HANWHA POWER SYSTEMS CO., LTD. |
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| 9617855 | Reaction-type turbine | Oct 12, 12 | Apr 11, 17 | HK TURBINE CO., LTD. |
| 9523277 | Turbine engine | Dec 02, 05 | Dec 20, 16 | RECOGEN, LLC |
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| 9115646 | Shroud for rotary engine | Jun 16, 11 | Aug 25, 15 | EXPONENTIAL TECHNOLOGIES, INC. |
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| 9061587 | Energy conversion device | Apr 24, 12 | Jun 23, 15 | Shires, Ronald Alan |
| 9035482 | Spiral turbine operating on pressure principle | Mar 07, 14 | May 19, 15 | MONARCH POWER CORP |
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