F01C 21/104
Stators
Official title: {Stators; Members defining the outer boundaries of the working chamber}
F01C21/104 (Stators) appears on 621 US grants and 565 published applications in this corpus.
Search patents in F01C- Granted patents
- 621
- Published applications
- 565
- Assignees
- 321
- Inventors
- 1,273
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 10 | 0 |
| 1978 | 11 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 4 | 0 |
| 1984 | 7 | 0 |
| 1985 | 7 | 0 |
| 1986 | 2 | 0 |
| 1987 | 7 | 0 |
| 1988 | 11 | 0 |
| 1989 | 9 | 0 |
| 1990 | 1 | 0 |
| 1991 | 5 | 0 |
| 1992 | 7 | 0 |
| 1993 | 6 | 0 |
| 1994 | 7 | 0 |
| 1995 | 6 | 0 |
| 1996 | 5 | 0 |
| 1997 | 2 | 0 |
| 1998 | 5 | 0 |
| 1999 | 6 | 0 |
| 2000 | 10 | 0 |
| 2001 | 13 | 5 |
| 2002 | 10 | 4 |
| 2003 | 6 | 13 |
| 2004 | 7 | 19 |
| 2005 | 10 | 20 |
| 2006 | 11 | 18 |
| 2007 | 11 | 13 |
| 2008 | 13 | 20 |
| 2009 | 10 | 8 |
| 2010 | 8 | 15 |
| 2011 | 14 | 12 |
| 2012 | 8 | 12 |
| 2013 | 13 | 31 |
| 2014 | 17 | 34 |
| 2015 | 20 | 48 |
| 2016 | 26 | 38 |
| 2017 | 42 | 53 |
| 2018 | 42 | 37 |
| 2019 | 30 | 19 |
| 2020 | 34 | 24 |
| 2021 | 17 | 31 |
| 2022 | 32 | 24 |
| 2023 | 22 | 17 |
| 2024 | 30 | 27 |
| 2025 | 23 | 16 |
| 2026 | 10 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Fretting resistant rotary engine housings18 Aug 2026US 12,709,983 B2Pratt & Whitney Canada Corp.
- Method for producing a housing, and shell housing and housing for a rotary piston engine26 May 2026US 12,637,946 B2Knapp e-mobility GmbH
- Connecting ring of a root vacuum pump5 May 2026US 12,618,407 B1Ching Link Consultant Company, Ltd
- Moving wall multiphase compressor-pump-expander system21 Apr 2026US 12,607,188 B1
- Shell stator for a vacuum pump14 Apr 2026US 12,601,261 B2Edwards Limited
- Pump stator tie-layer with surface roughness20 Aug 2026US 2026/0243253 A1Schlumberger Technology Corporation
- Stator with non-uniform thickness for one-to-two lobe ratio pumps6 Aug 2026US 2026/0226894 A1Schlumberger Technology Corporation
- Volumetric heat engine with piston-pendulum30 Jul 2026US 2026/0218647 A1
- Rotary Engine Housing16 Jul 2026US 2026/0201831 A1Pratt & Whitney Canada Corp.
- Sinusoidal pump with blocking slide, and production method14 May 2026US 2026/0132788 A1Watson Marlow GmbH - MasoSine Division
Most cited
By later US patents
- Portable ventilator system278US 7,188,621 B2Pulmonetic Systems, Inc. · 2007
- Compressor pulse width modulation172US 6,213,731 B1Copeland Corporation · 2001
- Molten metal pump with monolithic rotor115US 6,093,000 A2000
- Monolithic rotor and rigid coupling110US 6,398,525 B12002
- Vane type compressor having elliptical stator with doubly-offset rotor52US 4,410,305 AThe Rovac Corporation · 1983