F04C 29/12
Arrangements for admission or discharge of the working fluid
Official title: Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
F04C29/12 (Arrangements for admission or discharge of the working fluid) appears on 1,202 US grants and 1,158 published applications in this corpus.
Search patents in F04C- Granted patents
- 1,202
- Published applications
- 1,158
- Assignees
- 377
- Inventors
- 2,199
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 6 | 0 |
| 1979 | 4 | 0 |
| 1980 | 3 | 0 |
| 1981 | 6 | 0 |
| 1982 | 5 | 0 |
| 1983 | 5 | 0 |
| 1984 | 8 | 0 |
| 1985 | 12 | 0 |
| 1986 | 8 | 0 |
| 1987 | 9 | 0 |
| 1988 | 8 | 0 |
| 1989 | 11 | 0 |
| 1990 | 8 | 0 |
| 1991 | 8 | 0 |
| 1992 | 10 | 0 |
| 1993 | 13 | 0 |
| 1994 | 13 | 0 |
| 1995 | 10 | 0 |
| 1996 | 12 | 0 |
| 1997 | 13 | 0 |
| 1998 | 15 | 0 |
| 1999 | 11 | 0 |
| 2000 | 21 | 0 |
| 2001 | 23 | 3 |
| 2002 | 13 | 18 |
| 2003 | 15 | 12 |
| 2004 | 19 | 17 |
| 2005 | 9 | 23 |
| 2006 | 15 | 19 |
| 2007 | 10 | 20 |
| 2008 | 7 | 17 |
| 2009 | 12 | 27 |
| 2010 | 11 | 31 |
| 2011 | 17 | 34 |
| 2012 | 25 | 36 |
| 2013 | 23 | 37 |
| 2014 | 31 | 43 |
| 2015 | 38 | 63 |
| 2016 | 39 | 66 |
| 2017 | 53 | 85 |
| 2018 | 63 | 88 |
| 2019 | 68 | 64 |
| 2020 | 66 | 82 |
| 2021 | 73 | 61 |
| 2022 | 82 | 60 |
| 2023 | 69 | 68 |
| 2024 | 102 | 70 |
| 2025 | 68 | 56 |
| 2026 | 28 | 58 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Rotary compressor and refrigeration cycle device having the same6 Oct 2026US 12,753,760 B2LG Electronics Inc.
- Electric compressor with integrated vapor injection circuit29 Sep 2026US 12,747,729 B2Mahle International GmbH
- Antirotation reed valve systems and methods for compressors15 Sep 2026US 12,736,053 B2Copeland Corporation
- Compressor8 Sep 2026US 12,729,689 B2Hitachi-Johnson Controls Air Conditioning, Inc.
- Scroll compressor1 Sep 2026US 12,723,586 B2Kabushiki Kaisha Toyota Jidoshokki
- Scroll compressor with a sealing ring for a fixed disk check valve8 Oct 2026US 2026/0309151 A1Hitachi-Johnson Controls Air Conditioning, Inc.
- Compressor1 Oct 2026US 2026/0298233 A1Samsung Electronics Co., Ltd.
- Scroll compressor1 Oct 2026US 2026/0298234 A1Ishikawa Energy Research Co., Ltd.
- Fixed scroll assembly, scroll compressor, and method for machining fixed scroll assembly1 Oct 2026US 2026/0298235 A1Copeland Climate Technologies (Suzhou) Co. Ltd.
- Pump Body Assembly and Rolling Piston Compressor1 Oct 2026US 2026/0298237 A1Shanghai Highly Electrical Appliances Co., Ltd.
Most cited
By later US patents
- Portable ventilator system278US 7,188,621 B2Pulmonetic Systems, Inc. · 2007
- Compressor having functions of discharge interruption and discharge control of pressurized gas126US 4,410,299 AOgura Glutch Co., Ltd. · 1983
- Scroll compressor having bypass valves113US 5,855,475 AMatsushita Electric Industrial Co., Ltd. · 1999
- Refrigeration system incorporating scroll type compressor84US 4,475,360 AHitachi, Ltd. · 1984
- Suction baffle for refrigeration compressor84US 5,055,010 ACopeland Corporation · 1991