F04C 29/042
By injecting a fluid
Official title: {by injecting a fluid (injection of fluid for sealing, cooling or lubrication F04C29/0007)}
F04C29/042 (By injecting a fluid) appears on 259 US grants and 239 published applications in this corpus.
Search patents in F04C- Granted patents
- 259
- Published applications
- 239
- Assignees
- 115
- Inventors
- 543
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 3 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 4 | 0 |
| 1985 | 3 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 5 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 7 | 0 |
| 1993 | 3 | 0 |
| 1994 | 1 | 0 |
| 1995 | 5 | 0 |
| 1996 | 3 | 0 |
| 1997 | 4 | 0 |
| 1998 | 3 | 0 |
| 1999 | 1 | 0 |
| 2000 | 4 | 0 |
| 2001 | 5 | 0 |
| 2002 | 1 | 3 |
| 2003 | 8 | 13 |
| 2004 | 10 | 9 |
| 2005 | 7 | 5 |
| 2006 | 6 | 8 |
| 2007 | 7 | 7 |
| 2008 | 1 | 15 |
| 2009 | 4 | 5 |
| 2010 | 8 | 10 |
| 2011 | 2 | 5 |
| 2012 | 2 | 6 |
| 2013 | 8 | 10 |
| 2014 | 8 | 6 |
| 2015 | 7 | 14 |
| 2016 | 5 | 3 |
| 2017 | 10 | 8 |
| 2018 | 6 | 15 |
| 2019 | 8 | 7 |
| 2020 | 10 | 12 |
| 2021 | 11 | 17 |
| 2022 | 17 | 16 |
| 2023 | 9 | 13 |
| 2024 | 23 | 10 |
| 2025 | 10 | 12 |
| 2026 | 8 | 10 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for controlling an air-cooled compressor or vacuum pump device and an air-cooled compressor or vacuum pump device4 Aug 2026US 12,698,774 B2Atlas Copco Airpower, Naamloze Vennootschap
- Liquid feeding system of compressor19 May 2026US 12,631,180 B2Hitachi, Ltd.
- Compressor and additional oil injection system having same5 May 2026US 12,618,408 B2Atlas Copco (Wuxi) Compressor Co., Ltd.
- Airend having a lubricant flow valve and controller28 Apr 2026US 12,612,914 B2Ingersoll-Rand Industrial U.S., Inc.
- Assembly for compressing gas having a housing comprising coolers in a central section, method for cooling, and use of such an assembly3 Mar 2026US 12,565,881 B2Atlas Copco Airpower, Naamloze Vennootschap
- Rotary compressor8 Oct 2026US 2026/0309155 A1Fujitsu General Limited
- Gas Compressor20 Aug 2026US 2026/0243258 A1Hitachi Industrial Equipment Systems Co., Ltd.
- Electric compressor with integrated vapor injection circuit30 Jul 2026US 2026/0218703 A1Mahle International GmbH
- Hermetic compressor and refrigeration cycle apparatus30 Jul 2026US 2026/0218707 A1Mitsubishi Electric Corporation
- Hermetic compressor and refrigeration cycle apparatus16 Jul 2026US 2026/0201886 A1Mitsubishi Electric Corporation
Most cited
By later US patents
- Scroll machine having liquid injection controlled by internal valve92US 5,640,854 ACopeland Corporation · 1997
- Digital scroll condensing unit controller88US 6,601,397 B2Copeland Corporation · 2003
- Overheat preventing method for prescribed displacement type compressor and apparatus for the same85US 5,243,827 AHitachi, Ltd. · 1993
- Refrigeration system incorporating scroll type compressor84US 4,475,360 AHitachi, Ltd. · 1984
- Scroll machine with ported orbiting scroll member80US 6,350,111 B1Copeland Corporation · 2002