F01C 21/008
Driving elements, brakes, couplings, transmissions specially adapted for rotary or oscillating-piston machines
Official title: {Driving elements, brakes, couplings, transmissions specially adapted for rotary or oscillating-piston machines or engines (brakes, couplings, transmissions per se F16, B60)}
F01C21/008 (Driving elements, brakes, couplings, transmissions specially adapted for rotary or oscillating-piston machines) appears on 143 US grants and 145 published applications in this corpus.
Search patents in F01C- Granted patents
- 143
- Published applications
- 145
- Assignees
- 88
- Inventors
- 270
- Latest grant
- 19 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 3 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 5 | 0 |
| 1985 | 5 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 4 | 0 |
| 1989 | 3 | 0 |
| 1990 | 3 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 3 |
| 2004 | 1 | 5 |
| 2005 | 0 | 5 |
| 2006 | 5 | 6 |
| 2007 | 5 | 4 |
| 2008 | 0 | 3 |
| 2009 | 2 | 4 |
| 2010 | 5 | 9 |
| 2011 | 6 | 10 |
| 2012 | 4 | 4 |
| 2013 | 3 | 6 |
| 2014 | 4 | 9 |
| 2015 | 7 | 8 |
| 2016 | 7 | 14 |
| 2017 | 9 | 12 |
| 2018 | 7 | 8 |
| 2019 | 10 | 2 |
| 2020 | 8 | 8 |
| 2021 | 5 | 3 |
| 2022 | 2 | 5 |
| 2023 | 6 | 4 |
| 2024 | 5 | 3 |
| 2025 | 2 | 5 |
| 2026 | 3 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Rotary machine5 May 2026US 12,618,328 B2Lumenium LLC
- Positive displacement rotary machine10 Feb 2026US 12,546,221 B2Tocircle Industries AS
- Rotational engine with inner and outer rings7 Oct 2025US 12,435,632 B2Duplicent, LLC
- High-efficiency sine rotary engine17 Jun 2025US 12,331,645 B2
- Rotational Engine With Inner and Outer Rings17 Sep 2026US 2026/0275867 A1Duplicent, LLC
- Rotary machine17 Sep 2026US 2026/0275868 A1Lumenium LLC
- Fluid machine11 Jun 2026US 2026/0160167 A1
- Tangential internal combustion engine26 Feb 2026US 2026/0055723 A1Fnf Innovation Sh.P.K.
- Positive displacement rotary machine18 Sep 2025US 2025/0290420 A1Tocircle Industries AS
Most cited
By later US patents
- Drive mechanism for a scroll type fluid displacement apparatus53US 4,466,784 ASanden Corporation · 1984
- Scroll compressor with lubricated flat driving surface34US 4,954,057 ACopeland Corporation · 1990
- Fluid pump having expansion device and rankine cycle using the same32US 7,735,335 B2Denso Corporation · 2010
- Cycloid rotor engine32US 8,523,546 B2LiquidPiston, Inc. · 2013
- Involute scroll-type positive displacement rotary fluid apparatus with orbiting guide means30US 4,424,010 AArthur D. Little, Inc. · 1984