F01C 1/22
Rotary-piston machines or engines: of internal-axis type with equidirectional movement of co-operating
Official title: of internal-axis type with equidirectional movement of co-operating members at the points of engagement, or with one of the co-operating members being stationary, the inner member having more teeth or tooth- equivalents than the outer member
F01C1/22 (Rotary-piston machines or engines: of internal-axis type with equidirectional movement of co-operating) appears on 381 US grants and 328 published applications in this corpus.
Search patents in F01C- Granted patents
- 381
- Published applications
- 328
- Assignees
- 124
- Inventors
- 416
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 15 | 0 |
| 1977 | 12 | 0 |
| 1978 | 10 | 0 |
| 1979 | 3 | 0 |
| 1980 | 4 | 0 |
| 1981 | 3 | 0 |
| 1982 | 0 | 0 |
| 1983 | 6 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 4 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 5 | 0 |
| 1995 | 5 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 3 | 0 |
| 1999 | 0 | 0 |
| 2000 | 3 | 0 |
| 2001 | 2 | 0 |
| 2002 | 3 | 5 |
| 2003 | 2 | 4 |
| 2004 | 6 | 6 |
| 2005 | 6 | 6 |
| 2006 | 4 | 10 |
| 2007 | 6 | 8 |
| 2008 | 1 | 7 |
| 2009 | 4 | 6 |
| 2010 | 5 | 9 |
| 2011 | 5 | 13 |
| 2012 | 4 | 5 |
| 2013 | 9 | 23 |
| 2014 | 18 | 26 |
| 2015 | 18 | 19 |
| 2016 | 15 | 26 |
| 2017 | 14 | 20 |
| 2018 | 24 | 29 |
| 2019 | 23 | 15 |
| 2020 | 30 | 25 |
| 2021 | 23 | 16 |
| 2022 | 15 | 8 |
| 2023 | 13 | 9 |
| 2024 | 25 | 16 |
| 2025 | 14 | 12 |
| 2026 | 6 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Fretting resistant rotary engine housings18 Aug 2026US 12,709,983 B2Pratt & Whitney Canada Corp.
- Rotary engine lubrication system16 Jun 2026US 12,655,763 B2Compound Rotary Engines Limited
- Method for producing a housing, and shell housing and housing for a rotary piston engine26 May 2026US 12,637,946 B2Knapp e-mobility GmbH
- Rotary machine5 May 2026US 12,618,328 B2Lumenium LLC
- Systems and methods for rocket propulsion including rocket motor using powder monopropellant14 Apr 2026US 12,601,313 B2Powder Fuels Ltd
- Rotary piston internal combustion engines1 Oct 2026US 2026/0298091 A1Compound Rotary Engines Limited
- Rotary machine17 Sep 2026US 2026/0275868 A1Lumenium LLC
- Rotary Engine Housing16 Jul 2026US 2026/0201831 A1Pratt & Whitney Canada Corp.
- EPIC Cycles for the EPIC Cycle Engine30 Apr 2026US 2026/0117695 A1The United States of America as represented by the Secretary of the Navy
- Housing assembly for rotary engine and method of manufacturing thereof19 Mar 2026US 2026/0078695 A1Pratt & Whitney Canada Corp.
Most cited
By later US patents
- Rotary positive displacement device134US 5,431,551 A1995
- Compound cycle rotary engine85US 7,753,036 B2United Technologies Corporation · 2010
- Aircraft compound cycle propulsion engine54US 5,692,372 AROLLS-ROYCE plc · 1997
- Rotary steam engine43US 4,047,856 A1977
- Rotary trochoidal compressor with compressible sealing37US 4,028,021 ACurtiss-Wright Corporation · 1977