F03D 9/17
Storing energy in pressurised fluids
Official title: storing energy in pressurised fluids
F03D9/17 (Storing energy in pressurised fluids) appears on 223 US grants and 311 published applications in this corpus.
Search patents in F03D- Granted patents
- 223
- Published applications
- 311
- Assignees
- 116
- Inventors
- 404
- Latest grant
- 14 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 3 | 0 |
| 1978 | 0 | 0 |
| 1979 | 4 | 0 |
| 1980 | 4 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 3 | 0 |
| 1985 | 4 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 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 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 3 |
| 2003 | 0 | 1 |
| 2004 | 2 | 0 |
| 2005 | 1 | 7 |
| 2006 | 1 | 13 |
| 2007 | 3 | 11 |
| 2008 | 4 | 7 |
| 2009 | 2 | 13 |
| 2010 | 6 | 25 |
| 2011 | 13 | 29 |
| 2012 | 17 | 24 |
| 2013 | 21 | 28 |
| 2014 | 22 | 28 |
| 2015 | 7 | 18 |
| 2016 | 12 | 10 |
| 2017 | 12 | 12 |
| 2018 | 7 | 13 |
| 2019 | 10 | 14 |
| 2020 | 13 | 16 |
| 2021 | 11 | 6 |
| 2022 | 8 | 5 |
| 2023 | 4 | 12 |
| 2024 | 3 | 9 |
| 2025 | 15 | 3 |
| 2026 | 1 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Flexible operation and reciprocating near-isothermal gas compressor/expander for wind energy storage20 Aug 2026US 2026/0243228 A1University of Virginia Patent Foundation
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Most cited
By later US patents
- Natural energy conversion, storage and electricity generation system162US 4,206,608 A1980
- Energy storage system122US 3,996,741 A1976
- Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange119US 8,436,489 B2LightSail Energy, Inc. · 2013
- Power plant for camping trailer118US 4,229,661 A1980
- Means for activating hydraulic motors99US 4,031,702 A1977