F04B 39/0055
With a special shape of fluid passage
Official title: {with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes}
F04B39/0055 (With a special shape of fluid passage) appears on 568 US grants and 534 published applications in this corpus.
Search patents in F04B- Granted patents
- 568
- Published applications
- 534
- Assignees
- 239
- Inventors
- 1,125
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 3 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 6 | 0 |
| 1984 | 2 | 0 |
| 1985 | 5 | 0 |
| 1986 | 3 | 0 |
| 1987 | 3 | 0 |
| 1988 | 9 | 0 |
| 1989 | 2 | 0 |
| 1990 | 6 | 0 |
| 1991 | 4 | 0 |
| 1992 | 10 | 0 |
| 1993 | 14 | 0 |
| 1994 | 6 | 0 |
| 1995 | 5 | 0 |
| 1996 | 17 | 0 |
| 1997 | 13 | 0 |
| 1998 | 16 | 0 |
| 1999 | 14 | 0 |
| 2000 | 13 | 0 |
| 2001 | 16 | 3 |
| 2002 | 18 | 21 |
| 2003 | 24 | 15 |
| 2004 | 13 | 30 |
| 2005 | 7 | 21 |
| 2006 | 11 | 21 |
| 2007 | 8 | 18 |
| 2008 | 4 | 18 |
| 2009 | 8 | 23 |
| 2010 | 8 | 19 |
| 2011 | 13 | 16 |
| 2012 | 12 | 16 |
| 2013 | 14 | 24 |
| 2014 | 12 | 20 |
| 2015 | 19 | 30 |
| 2016 | 13 | 17 |
| 2017 | 20 | 25 |
| 2018 | 21 | 31 |
| 2019 | 18 | 30 |
| 2020 | 27 | 24 |
| 2021 | 24 | 24 |
| 2022 | 22 | 29 |
| 2023 | 23 | 23 |
| 2024 | 31 | 15 |
| 2025 | 20 | 12 |
| 2026 | 3 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Inlet silencer for a volumetric compressor and volumetric compressor equipped with it8 Sep 2026US 12,729,672 B2Atlas Copco Airpower, Naamloze Vennootschap
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- Reciprocating compressor17 Feb 2026US 12,553,427 B2LG Electronics Inc.
- Personal air sampling pump assembly9 Dec 2025US 12,492,694 B2Casella Holdings Limited
- Acoustic silencer for a urine suction system4 Nov 2025US 12,458,525 B2Purewick Corporation
- Reciprocating compressor8 Oct 2026US 2026/0309141 A1LG Electronics Inc.
- Pressure pulsation muffling device9 Jul 2026US 2026/0194052 A1Trane International Inc.
- Muffler assemblies for climate control systems9 Jul 2026US 2026/0194277 A1Trane International Inc.
- Oil-free air compressor and vehicle2 Jul 2026US 2026/0185513 A1Zhejiang Ruili Air Copressor Equipment Co., Ltd.
- Reciprocating compressor25 Jun 2026US 2026/0177045 A1LG Electronics Inc.
Most cited
By later US patents
- Multi-stage low pressure drop muffler78US 8,016,071 B1Trane International Inc. · 2011
- Suction accumulator76US 6,220,050 B1Tecumseh Products Company · 2001
- Suction muffler for compressor76US 6,446,454 B1LG Electronics Inc. · 2002
- Muffler system for refrigeration compressor70US 4,401,418 AWhite Consolidated Industries, Inc. · 1983
- Hermetic motor-compressor unit for refrigeration circuits62US 4,793,775 AAspera, Inc. · 1988