F01C 1/20
With dissimilar tooth forms
Official title: with dissimilar tooth forms (F01C1/16 takes precedence)
F01C1/20 (With dissimilar tooth forms) appears on 101 US grants and 73 published applications in this corpus.
Search patents in F01C- Granted patents
- 101
- Published applications
- 73
- Assignees
- 38
- Inventors
- 135
- Latest grant
- 14 Jan 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 4 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 4 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 4 | 0 |
| 2001 | 3 | 0 |
| 2002 | 4 | 3 |
| 2003 | 3 | 5 |
| 2004 | 4 | 3 |
| 2005 | 2 | 5 |
| 2006 | 1 | 5 |
| 2007 | 2 | 6 |
| 2008 | 0 | 2 |
| 2009 | 3 | 5 |
| 2010 | 3 | 9 |
| 2011 | 1 | 1 |
| 2012 | 5 | 2 |
| 2013 | 1 | 3 |
| 2014 | 3 | 6 |
| 2015 | 5 | 5 |
| 2016 | 3 | 1 |
| 2017 | 4 | 5 |
| 2018 | 3 | 1 |
| 2019 | 2 | 1 |
| 2020 | 0 | 0 |
| 2021 | 2 | 0 |
| 2022 | 0 | 2 |
| 2023 | 1 | 1 |
| 2024 | 1 | 0 |
| 2025 | 1 | 2 |
By publication year. Applications have been published since 2001.
Recent patents
- System and method of hydrogen fuel injection14 Jan 2025US 12,196,162 B1Astron Aerospace LLC
- Rotary engine, parts thereof, and methods10 Dec 2024US 12,163,461 B2Astron Aerospace LLC
- Rotary engine, parts thereof, and methods17 Oct 2023US 11,788,462 B2Astron Aerospace LLC
- Positive displacement rotary devices7 Sep 2021US 11,111,788 B2Mallen Research Limited Partnership
- Rotary valve continuous flow expansible chamber dynamic and positive displacement rotary devices3 Aug 2021US 11,078,834 B2
- Internal combustion engine21 Aug 2025US 2025/0264023 A1
- Rotary engine, parts thereof, and methods5 Jun 2025US 2025/0179956 A1Astron Aerospace LLC
- Rotary engine, parts thereof, and methods23 Mar 2023US 2023/0092617 A1Astron Aerospace LLC
- Erez Engine - An Internal Combustion Rotary Engine4 Aug 2022US 2022/0243648 A1
- Rotary engine, parts thereof, and methods24 Feb 2022US 2022/0056802 A1Astron Aerospace LLC
Most cited
By later US patents
- Rotary prime mover and compressor and methods of operation thereof31US 4,086,880 A1978
- Rotary engine23US 6,129,067 A2000
- Isochoric heat addition engines and methods22US 8,863,724 B2LiquidPiston, Inc. · 2014
- Internal combustion engines21US 4,057,035 A1977
- Fluid machine21US 4,747,762 AFairbairn International PTY. Ltd. · 1988