F03C 2/08
Rotary-piston engines: of intermeshing-engagement type, i.e. with engagement of co- operating members
Official title: of intermeshing-engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
F03C2/08 (Rotary-piston engines: of intermeshing-engagement type, i.e. with engagement of co- operating members) appears on 136 US grants and 129 published applications in this corpus.
Search patents in F03C- Granted patents
- 136
- Published applications
- 129
- Assignees
- 66
- Inventors
- 231
- Latest grant
- 23 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 3 | 0 |
| 2001 | 3 | 1 |
| 2002 | 1 | 1 |
| 2003 | 2 | 4 |
| 2004 | 3 | 2 |
| 2005 | 3 | 4 |
| 2006 | 0 | 7 |
| 2007 | 4 | 3 |
| 2008 | 2 | 2 |
| 2009 | 2 | 4 |
| 2010 | 3 | 1 |
| 2011 | 0 | 7 |
| 2012 | 4 | 6 |
| 2013 | 4 | 8 |
| 2014 | 7 | 9 |
| 2015 | 8 | 9 |
| 2016 | 8 | 7 |
| 2017 | 6 | 11 |
| 2018 | 7 | 7 |
| 2019 | 9 | 7 |
| 2020 | 9 | 6 |
| 2021 | 11 | 8 |
| 2022 | 6 | 1 |
| 2023 | 3 | 4 |
| 2024 | 3 | 3 |
| 2025 | 5 | 4 |
| 2026 | 2 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
- Reverse Moineau motor and centrifugal pump assembly for producing fluids from a well46US 5,611,397 A1997
- Progressive cavity motors using composite materials44US 6,183,226 B22001
- Progressive cavity pumps using composite materials40US 5,759,019 A1998
- Down hole motor36US 4,415,316 AChristensen, Inc. · 1983
- Reverse Moineau motor and pump assembly for producing fluids from a well31US 5,417,281 A1995