| 9989041 | Thruster grid clear circuits and methods to clear thruster grids | Apr 22, 15 | Jun 05, 18 | The Boeing Company |
| 9982356 | Membrane template synthesis of microtube engines | May 23, 16 | May 29, 18 | The Regents of the University of California |
| 9980361 | Thermally isolated thermionic hollow cathodes | Jun 16, 17 | May 22, 18 | The Goverment of the United States of America as represented by the Secretary of the Navy |
| 9955564 | Dielectric barrier discharge device | Jun 13, 17 | Apr 24, 18 | Not available |
| 9938026 | Energy beam propulsion system | Jul 17, 17 | Apr 10, 18 | Not available |
| 9928984 | Gas inlet for an ion thruster | Apr 28, 17 | Mar 27, 18 | Airbus Defence and Space GmbH |
| 9909574 | Electrothermal space thruster heater for decomposable propellants | May 02, 16 | Mar 06, 18 | CU Aerospace, LLC |
| 9897079 | External discharge hall thruster | Dec 22, 16 | Feb 20, 18 | Karadag, Burak |
| 9874202 | Metallic wall hall thrusters | Jul 25, 16 | Jan 23, 18 | CALIFORNIA INSTITUTE OF TECHNOLOGY |
| 9863364 | Micro thruster uses and improvements | Jun 14, 13 | Jan 09, 18 | GAME CHANGERS, LLC |
| 9856862 | Hybrid electric propulsion for spacecraft | Mar 13, 14 | Jan 02, 18 | FALER, WESLEY GORDON |
| 9854660 | Ion accelerators | Jun 18, 13 | Dec 26, 17 | ASTRIUM LIMITED, ASTRIUM SAS, |
| 9828975 | Flow regulating system for supplying propellant fluid to an electric thruster of a space vehicle | Dec 09, 14 | Nov 28, 17 | SNECMA |
| 9822769 | Method and apparatus to produce high specific impulse and moderate thrust from a fusion-powered rocket engine | May 10, 13 | Nov 21, 17 | PRINCETON SATELLITE SYSTEMS, THE TRUSTEES OF PRINCETON UNIVERSITY, |
| 9784251 | Fault tolerant control system for distributed micro-thrusters | Mar 01, 12 | Oct 10, 17 | GAME CHANGERS, LLC, GAME CHANGERS, LLLC, |
| 9776742 | Device for forming a quasi-neutral beam of oppositely charged particles | Apr 14, 15 | Oct 03, 17 | CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, ECOLE POLYTECHNIQUE, |
| 9712031 | Electromagnetic propulsion system | Jul 17, 13 | Jul 18, 17 | Not available |
| 9670913 | Plasma actuating propulsion system for aerial vehicles | Dec 19, 14 | Jun 06, 17 | THE BOEING COMPANY |
| 9657725 | Ion thruster | Feb 22, 15 | May 23, 17 | Not available |
| 9638178 | Colloid thruster and method | Apr 14, 16 | May 02, 17 | BUSEK CO., INC. |