F01C 21/08
Rotary pistons
Official title: Rotary pistons (reciprocating pistons in general F16J)
F01C21/08 (Rotary pistons) appears on 1,261 US grants and 1,035 published applications in this corpus.
Search patents in F01C- Granted patents
- 1,261
- Published applications
- 1,035
- Assignees
- 465
- Inventors
- 1,954
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 18 | 0 |
| 1977 | 15 | 0 |
| 1978 | 19 | 0 |
| 1979 | 7 | 0 |
| 1980 | 12 | 0 |
| 1981 | 14 | 0 |
| 1982 | 8 | 0 |
| 1983 | 16 | 0 |
| 1984 | 17 | 0 |
| 1985 | 32 | 0 |
| 1986 | 15 | 0 |
| 1987 | 16 | 0 |
| 1988 | 15 | 0 |
| 1989 | 18 | 0 |
| 1990 | 21 | 0 |
| 1991 | 21 | 0 |
| 1992 | 19 | 0 |
| 1993 | 15 | 0 |
| 1994 | 8 | 0 |
| 1995 | 10 | 0 |
| 1996 | 21 | 0 |
| 1997 | 11 | 0 |
| 1998 | 13 | 0 |
| 1999 | 11 | 0 |
| 2000 | 30 | 0 |
| 2001 | 15 | 8 |
| 2002 | 20 | 29 |
| 2003 | 35 | 34 |
| 2004 | 21 | 43 |
| 2005 | 25 | 43 |
| 2006 | 27 | 31 |
| 2007 | 16 | 24 |
| 2008 | 16 | 39 |
| 2009 | 41 | 42 |
| 2010 | 24 | 30 |
| 2011 | 18 | 44 |
| 2012 | 23 | 39 |
| 2013 | 28 | 57 |
| 2014 | 39 | 73 |
| 2015 | 59 | 66 |
| 2016 | 52 | 52 |
| 2017 | 60 | 77 |
| 2018 | 57 | 52 |
| 2019 | 44 | 38 |
| 2020 | 44 | 61 |
| 2021 | 45 | 47 |
| 2022 | 50 | 24 |
| 2023 | 29 | 28 |
| 2024 | 41 | 22 |
| 2025 | 20 | 21 |
| 2026 | 10 | 11 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Sliding vane pump or turbine having track followers11 Aug 2026US 12,704,069 B2Amorphic Tech Ltd
- Coulisse—eccentric motor21 Jul 2026US 12,687,157 B2
- Hydraulic motor14 Jul 2026US 12,680,384 B2
- Split-type blade, fluid driving device and fluid driving proportional mixer19 May 2026US 12,629,648 B2Shanghai Vision Mechanical Joint Co., Ltd.
- Rotary machine5 May 2026US 12,618,328 B2Lumenium LLC
- Rotary Vane Internal Combustion Engine17 Sep 2026US 2026/0275869 A1
- Volumetric heat engine with piston-pendulum30 Jul 2026US 2026/0218647 A1
- Rotor-stator assembly for a rotary engine, compressor or pump, a rotary engine and a lifting unit and device25 Jun 2026US 2026/0176971 A1
- Rotary compressor25 Jun 2026US 2026/0177057 A1Siam Compressor Industry Co., Ltd.
- Sinusoidal pump with blocking slide, and production method14 May 2026US 2026/0132788 A1Watson Marlow GmbH - MasoSine Division
Most cited
By later US patents
- Rotary compressor with reduced lubrication sensitivity147US 5,947,710 ACarrier Corporation · 1999
- Sliding-blade rotary air-heat engine with isothermal compression of air99US 5,839,270 A1998
- Method for manufacturing a rotor for a rotary fluid pump75US 4,570,316 ANippon Piston Ring Co., Ltd. · 1986
- Rotary hydraulic vane pump with undervane passages for priming53US 4,386,891 AGeneral Motors Corporation · 1983
- Vane type compressor having elliptical stator with doubly-offset rotor52US 4,410,305 AThe Rovac Corporation · 1983