H01M 2250/407
Combination of fuel cells with mechanical energy generators
H01M2250/407 (Combination of fuel cells with mechanical energy generators) appears on 138 US grants and 199 published applications in this corpus.
Search patents in H01M- Granted patents
- 138
- Published applications
- 199
- Assignees
- 96
- Inventors
- 377
- Latest grant
- 5 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 2001 | 2 | 0 |
| 2002 | 1 | 6 |
| 2003 | 0 | 5 |
| 2004 | 4 | 10 |
| 2005 | 8 | 6 |
| 2006 | 6 | 9 |
| 2007 | 4 | 13 |
| 2008 | 7 | 7 |
| 2009 | 6 | 7 |
| 2010 | 8 | 6 |
| 2011 | 6 | 5 |
| 2012 | 6 | 8 |
| 2013 | 3 | 4 |
| 2014 | 4 | 32 |
| 2015 | 6 | 12 |
| 2016 | 13 | 9 |
| 2017 | 13 | 6 |
| 2018 | 5 | 3 |
| 2019 | 6 | 2 |
| 2020 | 5 | 6 |
| 2021 | 2 | 2 |
| 2022 | 3 | 6 |
| 2023 | 5 | 11 |
| 2024 | 8 | 14 |
| 2025 | 4 | 7 |
| 2026 | 3 | 3 |
By publication year. 2026 runs to 8 Oct.
Recent patents
- Hybrid turbofan and solid oxide fuel cell propulsion system and related methods5 May 2026US 12,617,537 B1The Boeing Company
- Marine thermal and electrical battery10 Mar 2026US 12,573,648 B2Lone Gull Holdings, Ltd.
- Aircraft hybrid motive power source system and method for controlling same24 Feb 2026US 12,559,247 B2IHI Corporation
- Power generation system30 Sep 2025US 12,431,513 B2Hamilton Sundstrand Corporation
- Power plant system and method of operating the same6 May 2025US 12,291,994 B2Siemens Energy Global GmbH & Co. KG
- Hybrid turboshaft and solid oxide fuel cell propulsion system and related methods25 Jun 2026US 2026/0175983 A1The Boeing Company
- Aircraft powerplant with boosted turbine engine and fuel cell system16 Apr 2026US 2026/0104165 A1Rtx Corporation
- Low-temperature rankine cycle system for recovering waste heat from a fuel cell system12 Mar 2026US 2026/0074243 A1GM Global Technology Operations LLC
- Compressor bypass for low altitude operations25 Dec 2025US 2025/0389230 A1ZeroAvia, Inc.
- Marine thermal and electrical battery25 Sep 2025US 2025/0300200 A1Lone Gull Holdings, Ltd.
Most cited
By later US patents
- Combined fuel cell and fuel combustion power generation systems108US 6,868,677 B2Clean Energy Systems, Inc. · 2005
- Combined fuel cell aircraft auxiliary power unit and environmental control system90US 7,380,749 B2The Boeing Company · 2008
- Hybrid solid oxide fuel cell aircraft auxiliary power unit87US 6,834,831 B2The Boeing Company · 2004
- Electric scooter with on-board charging system58US 6,326,765 B1Vectrix Corporation · 2001
- Enhanced high efficiency fuel cell/turbine power plant56US 6,896,988 B2FuelCell Energy, Inc. · 2005