F01C 21/00
Component parts, details or accessories not provided for in groups f01c1/00 -
Official title: Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
F01C21/00 (Component parts, details or accessories not provided for in groups f01c1/00 -) appears on 3,171 US grants and 2,662 published applications in this corpus.
Search patents in F01C- Granted patents
- 3,171
- Published applications
- 2,662
- Assignees
- 1,042
- Inventors
- 5,233
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 60 | 0 |
| 1977 | 55 | 0 |
| 1978 | 46 | 0 |
| 1979 | 14 | 0 |
| 1980 | 27 | 0 |
| 1981 | 25 | 0 |
| 1982 | 20 | 0 |
| 1983 | 38 | 0 |
| 1984 | 47 | 0 |
| 1985 | 63 | 0 |
| 1986 | 34 | 0 |
| 1987 | 34 | 0 |
| 1988 | 50 | 0 |
| 1989 | 38 | 0 |
| 1990 | 44 | 0 |
| 1991 | 34 | 0 |
| 1992 | 42 | 0 |
| 1993 | 39 | 0 |
| 1994 | 39 | 0 |
| 1995 | 35 | 0 |
| 1996 | 45 | 0 |
| 1997 | 31 | 0 |
| 1998 | 32 | 0 |
| 1999 | 37 | 0 |
| 2000 | 74 | 0 |
| 2001 | 63 | 15 |
| 2002 | 51 | 57 |
| 2003 | 60 | 61 |
| 2004 | 42 | 92 |
| 2005 | 44 | 92 |
| 2006 | 61 | 87 |
| 2007 | 46 | 56 |
| 2008 | 37 | 80 |
| 2009 | 61 | 92 |
| 2010 | 53 | 103 |
| 2011 | 56 | 108 |
| 2012 | 72 | 107 |
| 2013 | 71 | 159 |
| 2014 | 104 | 156 |
| 2015 | 127 | 185 |
| 2016 | 117 | 144 |
| 2017 | 139 | 154 |
| 2018 | 134 | 152 |
| 2019 | 122 | 126 |
| 2020 | 117 | 145 |
| 2021 | 124 | 119 |
| 2022 | 130 | 106 |
| 2023 | 101 | 83 |
| 2024 | 129 | 82 |
| 2025 | 74 | 62 |
| 2026 | 33 | 39 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F01C 21/08Rotary pistons1,261
- F01C 21/10Outer members for co-operation with rotary pistons1,220
- F01C 21/02Arrangements of bearings365
- F01C 21/18Arrangements for admission or discharge of the working fluid230
- F01C 21/007General arrangements of parts195
- F01C 21/06Heating194
- F01C 21/008Driving elements, brakes, couplings, transmissions specially adapted for rotary or oscillating-piston machines143
- F01C 21/04Lubrication140
All 12 subgroupsShow fewer
- F01C 21/003Systems for the equilibration of forces acting on the elements of the93
- F01C 2021/16Component parts, details or accessories not provided for in groups f01c1/00 -Indexing code15
- F01C 21/001Injection of a fluid in the working chamber for sealing, cooling and14
- F01C 2021/12Control of working fluid admission or dischargeIndexing code8
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.
- Fretting resistant rotary engine housings18 Aug 2026US 12,709,983 B2Pratt & Whitney Canada Corp.
- Sliding vane pump or turbine having track followers11 Aug 2026US 12,704,069 B2Amorphic Tech Ltd
- 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
- Pump stator tie-layer with surface roughness20 Aug 2026US 2026/0243253 A1Schlumberger Technology Corporation
Most cited
By later US patents
- Portable ventilator system278US 7,188,621 B2Pulmonetic Systems, Inc. · 2007
- 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
- Mounting body127US 6,216,691 B1ResMed Limited · 2001