F04C 29/061
Silencers using overlapping frequencies
Official title: {Silencers using overlapping frequencies, e.g. Helmholtz resonators}
F04C29/061 (Silencers using overlapping frequencies) appears on 80 US grants and 67 published applications in this corpus.
Search patents in F04C- Granted patents
- 80
- Published applications
- 67
- Assignees
- 49
- Inventors
- 156
- Latest grant
- 13 May 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 3 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 2 | 0 |
| 1998 | 3 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 3 | 0 |
| 2002 | 3 | 0 |
| 2003 | 0 | 1 |
| 2004 | 1 | 1 |
| 2005 | 2 | 2 |
| 2006 | 1 | 11 |
| 2007 | 1 | 2 |
| 2008 | 1 | 4 |
| 2009 | 4 | 4 |
| 2010 | 4 | 3 |
| 2011 | 3 | 2 |
| 2012 | 3 | 3 |
| 2013 | 4 | 5 |
| 2014 | 0 | 0 |
| 2015 | 4 | 7 |
| 2016 | 4 | 1 |
| 2017 | 7 | 3 |
| 2018 | 2 | 4 |
| 2019 | 1 | 2 |
| 2020 | 4 | 1 |
| 2021 | 2 | 4 |
| 2022 | 2 | 3 |
| 2023 | 2 | 2 |
| 2024 | 4 | 1 |
| 2025 | 1 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Screw compressor, refrigeration system, and method for controlling refrigeration system13 May 2025US 12,297,835 B2Johnson Controls Air Conditioning and Refrigeration (Wuxi) Co., Ltd.
- Scroll compressor26 Nov 2024US 12,152,590 B2Siam Compressor Industry Co., Ltd.
- Compressor29 Oct 2024US 12,129,854 B2LG Electronics Inc.
- Compressor and electronic device using the same9 Jul 2024US 12,031,540 B2Samsung Electronics Co., Ltd.
- Screw compressor configured to compress a process gas and dampen pulsation waves5 Mar 2024US 11,920,596 B2MAN Energy Solutions SE
- Rotary compressor16 Apr 2026US 2026/0104048 A1Samsung Electronics Co., Ltd.
- A scroll compressor10 Oct 2024US 2024/0337263 A1Siam Compressor Industry Co., Ltd.
- Screw compressor29 Jun 2023US 2023/0204034 A1MAN Energy Solutions SE
- Screw compressor, refrigeration system, and method for controlling refrigeration system4 May 2023US 2023/0138965 A1Johnson Controls Air Conditioning and Refrigeration (Wuxi) Co., Ltd.
- Vacuum pump having a silencer28 Apr 2022US 2022/0128055 A1Leybold Aktiengesellschaft
Most cited
By later US patents
- Shunt pulsation trap for positive-displacement machinery60US 9,732,754 B2Hi-Bar Blowers, Inc. · 2017
- Method and apparatus for attenuating compressor noise55US 7,527,053 B2Cardinal Health 203, Inc. · 2009
- Resonating device for a pneumatic surgical instrument36US 6,935,459 B2Stryker Instruments · 2005
- Scroll compression having a discharge muffler chamber26US 5,674,061 AMitsubishi Denki Kabushiki Kaisha · 1997
- Fluid machine having a pair of rotors and a silencer22US 6,331,103 B1Tochigi Fuji Sangyo Kabushiki Kaisha · 2001