F01C 1/08
Rotary-piston machines or engines: of intermeshing engagement type, i.e. with engagement of
Official title: of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
F01C1/08 (Rotary-piston machines or engines: of intermeshing engagement type, i.e. with engagement of) appears on 622 US grants and 511 published applications in this corpus.
Search patents in F01C- Granted patents
- 622
- Published applications
- 511
- Assignees
- 277
- Inventors
- 989
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 28 | 0 |
| 1977 | 13 | 0 |
| 1978 | 9 | 0 |
| 1979 | 12 | 0 |
| 1980 | 9 | 0 |
| 1981 | 3 | 0 |
| 1982 | 8 | 0 |
| 1983 | 7 | 0 |
| 1984 | 12 | 0 |
| 1985 | 7 | 0 |
| 1986 | 3 | 0 |
| 1987 | 13 | 0 |
| 1988 | 14 | 0 |
| 1989 | 12 | 0 |
| 1990 | 12 | 0 |
| 1991 | 5 | 0 |
| 1992 | 7 | 0 |
| 1993 | 5 | 0 |
| 1994 | 9 | 0 |
| 1995 | 6 | 0 |
| 1996 | 3 | 0 |
| 1997 | 3 | 0 |
| 1998 | 7 | 0 |
| 1999 | 5 | 0 |
| 2000 | 9 | 0 |
| 2001 | 11 | 1 |
| 2002 | 9 | 6 |
| 2003 | 7 | 23 |
| 2004 | 11 | 15 |
| 2005 | 6 | 17 |
| 2006 | 17 | 21 |
| 2007 | 9 | 20 |
| 2008 | 4 | 19 |
| 2009 | 13 | 19 |
| 2010 | 12 | 32 |
| 2011 | 12 | 12 |
| 2012 | 13 | 19 |
| 2013 | 11 | 24 |
| 2014 | 21 | 39 |
| 2015 | 21 | 35 |
| 2016 | 25 | 26 |
| 2017 | 34 | 40 |
| 2018 | 30 | 26 |
| 2019 | 30 | 18 |
| 2020 | 17 | 23 |
| 2021 | 23 | 19 |
| 2022 | 20 | 13 |
| 2023 | 12 | 13 |
| 2024 | 20 | 9 |
| 2025 | 10 | 15 |
| 2026 | 3 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Downhole fluid motor and associated methods11 Aug 2026US 12,704,022 B2Thru Tubing Solutions, Inc.
- Logarithmic hollow shaft speed reducer14 Apr 2026US 12,601,391 B2
- Rotary piston machine3 Feb 2026US 12,540,572 B2
- Rotor tilt compensation in PDM stators2 Dec 2025US 12,486,771 B2Abaco Drilling Technologies LLC
- Complex screw rotors with a central circular cross section connecting right-hand and left-hand sections of the rotors4 Nov 2025US 12,460,640 B2Industrial Technologies and Services, LLC
- Hydraulic Motor with an Enhanced Multi-Purpose Passage9 Jul 2026US 2026/0194037 A1Parker-Hannifin Corporation
- Planetary rotor machine with double sheer synchronizing mechanism18 Jun 2026US 2026/0168381 A1Radius 1, LLC
- Complex screw rotors28 May 2026US 2026/0146608 A1
- EPIC Cycles for the EPIC Cycle Engine30 Apr 2026US 2026/0117695 A1The United States of America as represented by the Secretary of the Navy
- Two-Stroke Rotary Engine with Improved Inlet and Outlet Ports19 Mar 2026US 2026/0078674 A1LiquidPiston, Inc.
Most cited
By later US patents
- Composite stator construction for downhole drilling motors85US 5,171,138 ADrilex Systems, Inc. · 1992
- Respiratory therapy device and method79US 7,779,841 B2CareFusion 2200, Inc. · 2010
- Passive respiratory therapy device71US 8,025,054 B2CareFusion 2200, Inc. · 2011
- Progressive cavity drive train59US 4,080,115 AA-Z International Tool Company · 1978
- Quasi-isothermal brayton cycle engine55US 6,886,326 B2The Texas A&M University System · 2005