F03B
Machines or engines for liquids
Official title: MACHINES OR ENGINES FOR LIQUIDS (positive-displacement engines for liquid F03C; machines for liquids and gases F01; positive-displacement machines for liquids F04, rotary fluid gearing of the hydrokinetic type F16H41/00)
F03B (Machines or engines for liquids) appears on 5,113 US grants and 5,680 published applications in this corpus.
Search patents in F03B- Granted patents
- 5,113
- Published applications
- 5,680
- Assignees
- 1,897
- Inventors
- 8,369
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 51 | 0 |
| 1977 | 52 | 0 |
| 1978 | 61 | 0 |
| 1979 | 56 | 0 |
| 1980 | 69 | 0 |
| 1981 | 91 | 0 |
| 1982 | 68 | 0 |
| 1983 | 74 | 0 |
| 1984 | 69 | 0 |
| 1985 | 55 | 0 |
| 1986 | 58 | 0 |
| 1987 | 46 | 0 |
| 1988 | 60 | 0 |
| 1989 | 33 | 0 |
| 1990 | 26 | 0 |
| 1991 | 23 | 0 |
| 1992 | 25 | 0 |
| 1993 | 26 | 0 |
| 1994 | 22 | 0 |
| 1995 | 34 | 0 |
| 1996 | 19 | 0 |
| 1997 | 17 | 0 |
| 1998 | 25 | 0 |
| 1999 | 40 | 0 |
| 2000 | 38 | 0 |
| 2001 | 47 | 5 |
| 2002 | 35 | 42 |
| 2003 | 44 | 58 |
| 2004 | 53 | 75 |
| 2005 | 45 | 115 |
| 2006 | 69 | 106 |
| 2007 | 63 | 139 |
| 2008 | 85 | 181 |
| 2009 | 73 | 224 |
| 2010 | 116 | 359 |
| 2011 | 161 | 354 |
| 2012 | 178 | 312 |
| 2013 | 230 | 322 |
| 2014 | 258 | 343 |
| 2015 | 193 | 309 |
| 2016 | 196 | 266 |
| 2017 | 261 | 262 |
| 2018 | 175 | 279 |
| 2019 | 245 | 275 |
| 2020 | 233 | 264 |
| 2021 | 208 | 235 |
| 2022 | 174 | 244 |
| 2023 | 215 | 252 |
| 2024 | 229 | 261 |
| 2025 | 265 | 232 |
| 2026 | 124 | 166 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Main groups
Granted patents with any code in the group
- F03B 13/00Adaptations of machines or engines for special use3,372
- F03B 17/00Machines or engines for liquids: other machines or engines1,660
- F03B 3/00Machines or engines of reaction type760
- F03B 11/00Parts or details not provided for in, or of interest apart from488
- F03B 15/00Controlling463
- F03B 7/00Water wheels169
- F03B 1/00Engines of impulse type, i.e. turbines with jets of high-velocity liquid impinging145
- F03B 5/00Machines or engines characterised by non-bladed rotors46
All 9 main groupsShow fewer
Recent patents
- Submersible hydroelectric generator apparatus and method of operating same6 Oct 2026US 12,753,735 B2Static Hydro Energy (S.H.E.) Limited
- Hydraulic turbine29 Sep 2026US 12,747,716 B2Natel Energy Holdings, Inc.
- Energy capture device and system29 Sep 2026US 12,747,717 B1
- Synergistic tracking integrated photovoltaic and concentrating cogeneration solar energy harvesting system29 Sep 2026US 12,750,000 B2RIC Enterprises
- Modular underwater pumped-storage power plant reservoir22 Sep 2026US 12,742,435 B2
- Performance of airfoils and hydrofoils8 Oct 2026US 2026/0307777 A1SJK Energy Solutions, LLC
- Hydroturbine piece of a turbine comprising a modified trailing edge8 Oct 2026US 2026/0309114 A1GE Renewable Technologies
- Reconfigurable turbine for geothermal energy production8 Oct 2026US 2026/0309115 A1Sage Geosystems Inc.
- Fluid displacement energy storage systems and processes to enable pressure equilibrized subsea tank8 Oct 2026US 2026/0309116 A1Innovator Energy, LLC
- Wave energy converter8 Oct 2026US 2026/0309117 A1Breaking Wave Technologies Ltd.
Most cited
By later US patents
- Energy conversion systems and methods405US 10,060,473 B2Oceana Energy Company · 2018
- Well drilling tool with diamond radial/thrust bearings383US 4,410,054 AMaurer Engineering Inc. · 1983
- Fluid powered electrical generator260US 4,720,640 ATurboStar, Inc. · 1988
- Scavenger energy converter system its new applications and its control systems239US 6,327,994 B12001
- Water-mist blower cooling system and its new applications215US 6,293,121 B12001