| RE49259 | Methods and systems for managing a clearance gap in a piston engine | Nov 30, 20 | Oct 25, 22 | Mainspring Energy, Inc. |
| 9995201 | Low reactivity, compression-ignition, opposed-piston engine | Feb 11, 15 | Jun 12, 18 | Achates Power Inc. |
| 9995141 | Sliding block for a scotch yoke reciprocating piston engine | May 08, 14 | Jun 12, 18 | Not available |
| 9995213 | Asymmetrically-shaped combustion chamber for opposed-piston engines | Mar 31, 15 | Jun 12, 18 | Achates Power Inc. |
| 9995260 | Bi-fuel vehicle | Sep 04, 15 | Jun 12, 18 | GM Global Technology Operations LLC |
| 9995208 | Oscillating piston engine having a polygonal piston | Apr 22, 13 | Jun 12, 18 | Not available |
| 9982781 | Pistons | Oct 14, 15 | May 29, 18 | Fisher Controls International LLC |
| 9982597 | Compact non-vibrating endothermic engine | Mar 17, 14 | May 29, 18 | Not available |
| 9982538 | Method and apparatus for rotating liners in a rotating liner engine | Apr 04, 13 | May 29, 18 | Not available |
| 9963968 | Timed gas exchange in engine using piston as exhaust valve | Jul 14, 16 | May 08, 18 | Aquarius Engines (A.M.) Ltd. |
| 9963967 | Axial piston machine utilizing a bent-axis construction with a drive joint for driving the cylinder barrel | Mar 31, 15 | May 08, 18 | Linde Hydraulics GmbH & Co. KG |
| 9963969 | Piston assembly for internal combustion engine | Jul 14, 16 | May 08, 18 | Aquarius Engines (A.M.) Ltd. |
| 9957880 | Low reactivity, compression-ignition, opposed-piston engine | Aug 05, 16 | May 01, 18 | Achates Power Inc. |
| 9958041 | Power delivery devices for reciprocating engines and related systems and methods | Aug 08, 16 | May 01, 18 | Enfield Engine Company, LLC |
| 9951858 | Thermal bypass valve using shape memory alloys | Feb 03, 15 | Apr 24, 18 | GM Global Technology Operations LLC; Dynalloy, INC.; |
| 9951760 | Drive mechanism for rotary compressors or pumps | Mar 15, 13 | Apr 24, 18 | Not available |
| 9945397 | Systems and methods for actuating soft robotic actuators | Apr 02, 14 | Apr 17, 18 | President and Fellows of Harvard College |
| 9945361 | Stirling engine for an emission-free aircraft | Oct 07, 15 | Apr 17, 18 | EADS Deutschland GmbH |
| 9932972 | Hydraulic machine comprising cylinders provided with angularly offset openings | May 28, 14 | Apr 03, 18 | TECHNOBOOST |
| 9932827 | Hydraulic radial piston devices | Jan 09, 15 | Apr 03, 18 | EATON INTELLIGENT POWER LIMITED |