F02K 9/72
Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor: using liquid
Official title: using liquid and solid propellants, i.e. hybrid rocket-engine plants
F02K9/72 (Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor: using liquid) appears on 152 US grants and 118 published applications in this corpus.
Search patents in F02K- Granted patents
- 152
- Published applications
- 118
- Assignees
- 88
- Inventors
- 267
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 6 | 0 |
| 1993 | 0 | 0 |
| 1994 | 3 | 0 |
| 1995 | 0 | 0 |
| 1996 | 5 | 0 |
| 1997 | 1 | 0 |
| 1998 | 6 | 0 |
| 1999 | 2 | 0 |
| 2000 | 9 | 0 |
| 2001 | 6 | 1 |
| 2002 | 4 | 3 |
| 2003 | 1 | 6 |
| 2004 | 9 | 5 |
| 2005 | 4 | 4 |
| 2006 | 1 | 4 |
| 2007 | 3 | 2 |
| 2008 | 1 | 1 |
| 2009 | 2 | 6 |
| 2010 | 1 | 2 |
| 2011 | 3 | 4 |
| 2012 | 3 | 3 |
| 2013 | 3 | 6 |
| 2014 | 5 | 3 |
| 2015 | 2 | 4 |
| 2016 | 8 | 4 |
| 2017 | 2 | 5 |
| 2018 | 3 | 8 |
| 2019 | 1 | 0 |
| 2020 | 6 | 13 |
| 2021 | 4 | 5 |
| 2022 | 7 | 8 |
| 2023 | 8 | 10 |
| 2024 | 15 | 3 |
| 2025 | 6 | 5 |
| 2026 | 5 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Hybrid rocket engine fuel grains with radial energy compositional variations6 Oct 2026US 12,753,131 B2Firehawk Aerospace, Inc.
- Thrust vector control for hybrid propellants rocket engine with embedded fluid injection ports22 Sep 2026US 12,742,433 B2Laboratoire Reaction Dynamics Inc.
- Roll control thruster and hybrid rocket comprising same21 Apr 2026US 12,607,157 B2Innospace Co., Ltd.
- Sensitizing rocket propulsion engine20 Jan 2026US 12,529,350 B2Exquadrum, Inc.
- Miniaturized green end-burning hybrid propulsion system for cubesats13 Jan 2026US 12,522,381 B2
- Modulating internal ballistics in a 3d-printed rocket motor and an additive manufacturing process8 Oct 2026US 2026/0309106 A1X-Bow Launch Systems Inc.
- 3d-printed rocket fuel grains, rocket engines and an additive manufacturing process30 Apr 2026US 2026/0117725 A1X-Bow Launch Systems Inc.
- System and methods of group combustion of core-shell thermite particles12 Mar 2026US 2026/0070857 A1
- Hybrid Rocket Engine Fuel Grains with Radial Energy Compositional Variations14 Aug 2025US 2025/0257016 A1Firehawk Aerospace, Inc.
- Method for combusting of hybrid rocket fuel and device for combusting6 Feb 2025US 2025/0043751 A1National University Corporation Hokkaido University
Most cited
By later US patents
- Hybrid rocket system and integrated motor for use therein49US 5,715,675 AEnvironmental Aeroscience Corp. · 1998
- Systems and methods for casting hybrid rocket motor fuel grains38US 9,429,104 B2The Aerospace Corporation · 2016
- Hybrid rocket combustion enhancement34US 5,582,001 A1996
- Hybrid rocket motor using a turbopump to pressurize a liquid propellant constituent34US 6,684,625 B2Hy Pat Corporation · 2004
- Stereolithographic rocket motor manufacturing method34US 8,844,133 B2The Aerospace Corporation · 2014