F01K 3/02
Use of accumulators and specific engine types
Official title: Use of accumulators and specific engine types; Control thereof
F01K3/02 (Use of accumulators and specific engine types) appears on 156 US grants and 182 published applications in this corpus.
Search patents in F01K- Granted patents
- 156
- Published applications
- 182
- Assignees
- 57
- Inventors
- 188
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 1 |
| 2008 | 2 | 1 |
| 2009 | 0 | 1 |
| 2010 | 0 | 2 |
| 2011 | 0 | 2 |
| 2012 | 0 | 1 |
| 2013 | 3 | 3 |
| 2014 | 1 | 4 |
| 2015 | 2 | 14 |
| 2016 | 3 | 3 |
| 2017 | 6 | 5 |
| 2018 | 7 | 15 |
| 2019 | 6 | 4 |
| 2020 | 4 | 7 |
| 2021 | 10 | 9 |
| 2022 | 14 | 26 |
| 2023 | 19 | 30 |
| 2024 | 36 | 23 |
| 2025 | 16 | 23 |
| 2026 | 17 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Thermal energy storage system coupled with a solid oxide electrolysis system6 Oct 2026US 12,753,710 B2Rondo Energy, Inc.
- Two-phase thermal pump15 Sep 2026US 12,735,999 B2Rolls-Royce North American Technologies Inc.
- Thermal energy storage system coupled with thermal power cycle systems8 Sep 2026US 12,729,632 B1Rondo Energy, Inc.
- Thermal energy storage systems for use in material processing1 Sep 2026US 12,723,524 B2Rondo Energy, Inc.
- Thermodynamic cycle system with thermal plant integration1 Sep 2026US 12,723,542 B2Malta Inc.
- Thermal Energy Storage with Fluid Flow Insulation16 Jul 2026US 2026/0201821 A1Rondo Energy, Inc.
- Thermal energy storage system coupled with steam cracking system25 Jun 2026US 2026/0176985 A1Rondo Energy, Inc.
- Peak load and frequency regulation system for thermal power unit25 Jun 2026US 2026/0176987 A1Xi'an Thermal Power Research Institute Co., Ltd.
- Energy storage system and alumina calcination applications18 Jun 2026US 2026/0168411 A1Rondo Energy, Inc.
- Thermal energy storage systems for use in material processing2 Apr 2026US 2026/0092542 A1Rondo Energy, Inc.
Most cited
By later US patents
- High efficiency absorption heat pump and methods of use143US 7,313,926 B2Rexorce Thermionics, Inc. · 2008
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- Dispatchable solar hybrid power plant74US 9,816,490 B22017
- Power plant utilizing multi-stage turbines72US 4,428,190 AOrmat Turbines, Ltd. · 1984
- Systems and methods for generating electricity via a pumped thermal energy storage system64US 11,187,112 B2Echogen Power Systems, LLC · 2021