F01C
Rotary-piston or oscillating-piston machines or engines
Official title: ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES (internal-combustion aspects F02B53/00, F02B55/00)
F01C (Rotary-piston or oscillating-piston machines or engines) appears on 5,722 US grants and 4,052 published applications in this corpus.
Search patents in F01C- Granted patents
- 5,722
- Published applications
- 4,052
- Assignees
- 1,547
- Inventors
- 7,847
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 223 | 0 |
| 1977 | 153 | 0 |
| 1978 | 110 | 0 |
| 1979 | 58 | 0 |
| 1980 | 77 | 0 |
| 1981 | 54 | 0 |
| 1982 | 49 | 0 |
| 1983 | 85 | 0 |
| 1984 | 107 | 0 |
| 1985 | 109 | 0 |
| 1986 | 64 | 0 |
| 1987 | 89 | 0 |
| 1988 | 88 | 0 |
| 1989 | 93 | 0 |
| 1990 | 90 | 0 |
| 1991 | 76 | 0 |
| 1992 | 102 | 0 |
| 1993 | 88 | 0 |
| 1994 | 93 | 0 |
| 1995 | 86 | 0 |
| 1996 | 82 | 0 |
| 1997 | 60 | 0 |
| 1998 | 83 | 0 |
| 1999 | 73 | 0 |
| 2000 | 138 | 0 |
| 2001 | 134 | 29 |
| 2002 | 108 | 89 |
| 2003 | 100 | 96 |
| 2004 | 78 | 144 |
| 2005 | 77 | 155 |
| 2006 | 98 | 168 |
| 2007 | 81 | 123 |
| 2008 | 79 | 148 |
| 2009 | 98 | 161 |
| 2010 | 100 | 199 |
| 2011 | 93 | 165 |
| 2012 | 130 | 158 |
| 2013 | 118 | 225 |
| 2014 | 161 | 239 |
| 2015 | 184 | 254 |
| 2016 | 173 | 207 |
| 2017 | 210 | 216 |
| 2018 | 190 | 226 |
| 2019 | 186 | 184 |
| 2020 | 178 | 198 |
| 2021 | 180 | 173 |
| 2022 | 177 | 129 |
| 2023 | 139 | 119 |
| 2024 | 181 | 110 |
| 2025 | 98 | 86 |
| 2026 | 41 | 51 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Main groups
Granted patents with any code in the group
- F01C 21/00Component parts, details or accessories not provided for in groups f01c1/00 -3,171
- F01C 1/00Rotary-piston machines or engines2,386
- F01C 19/00Sealing arrangements in rotary-piston machines or engines603
- F01C 17/00Arrangements for drive of co-operating members539
- F01C 11/00Combinations of two or more machines or engines, each being of rotary-piston518
- F01C 20/00Control of, monitoring of, or safety arrangements for, machines or engines265
- F01C 9/00Oscillating-piston machines or engines253
- F01C 3/00Rotary-piston machines or engines with non-parallel axes of movement of co-operating members176
Recent patents
- Two-stroke rotary engine with improved inlet and outlet ports22 Sep 2026US 12,742,390 B2LiquidPiston, Inc.
- Supercharger22 Sep 2026US 12,742,412 B2Eaton Intelligent Power Limited
- Vertical type compressor and laundry treating apparatus having the same22 Sep 2026US 12,742,456 B2LG Electronics Inc.
- Scroll device with tip seals and backup seals25 Aug 2026US 12,716,415 B2Air Squared, Inc.
- Sealing gasket25 Aug 2026US 12,716,493 B2Edwards Limited
- Rotary piston internal combustion engines1 Oct 2026US 2026/0298091 A1Compound Rotary Engines Limited
- Rotational Engine With Inner and Outer Rings17 Sep 2026US 2026/0275867 A1Duplicent, LLC
- Rotary machine17 Sep 2026US 2026/0275868 A1Lumenium LLC
- Rotary Vane Internal Combustion Engine17 Sep 2026US 2026/0275869 A1
- Scroll fluid machine with elastic member27 Aug 2026US 2026/0251140 A1Anest Iwata Corporation
Most cited
By later US patents
- Portable ventilator system278US 7,188,621 B2Pulmonetic Systems, Inc. · 2007
- Scroll-type machine with axially compliant mounting226US 4,877,382 ACopeland Corporation · 1989
- Compressor pulse width modulation172US 6,213,731 B1Copeland Corporation · 2001
- Capacity modulated scroll machine162US 5,613,841 ACopeland Corporation · 1997
- Rotary compressor with reduced lubrication sensitivity147US 5,947,710 ACarrier Corporation · 1999