F01C 21/006
Equalization of pressure pulses
Official title: {Equalization of pressure pulses (silencing for compressors F04C29/06)}
F01C21/006 (Equalization of pressure pulses) appears on 13 US grants and 14 published applications in this corpus.
Search patents in F01C- Granted patents
- 13
- Published applications
- 14
- Assignees
- 12
- Inventors
- 27
- Latest grant
- 16 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 1 |
| 2004 | 1 | 0 |
| 2005 | 0 | 1 |
| 2006 | 2 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 4 |
| 2010 | 2 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
| 2015 | 1 | 0 |
| 2016 | 0 | 2 |
| 2017 | 1 | 0 |
| 2018 | 1 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 1 | 1 |
| 2023 | 0 | 0 |
| 2024 | 0 | 2 |
| 2025 | 1 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Quieted front exhaust motor16 Dec 2025US 12,496,699 B2Ingersoll-Rand Industrial U.S., Inc.
- Scroll expander with back pressure chamber19 Jul 2022US 11,391,154 B2Emerson Climate Technologies (Suzhou) Co., Ltd.
- Silent gear pump or motor suppressing troubles of trapping fluid17 Apr 2018US 9,945,230 B2
- Pulsation attenuation14 Feb 2017US 9,567,996 B2OPTIMUM Pumping Technology, Inc.
- Rotary piston and cylinder devices16 Jun 2015US 9,057,268 B2Lontra Limited
- Optimized energy recovery device14 Aug 2025US 2025/0257730 A1
- Air motor with increased dwell at max vane extension7 Nov 2024US 2024/0368992 A1
- Quieted front exhaust motor24 Oct 2024US 2024/0351180 A1Ingersoll-Rand Industrial U.S., Inc.
- Vortex Expander20 Jan 2022US 2022/0018346 A1Emerson Climate Technologies (Suzhou) Co., Ltd.
- A silent gear pump or motor suppressing troubles of trapping fluid21 Apr 2016US 2016/0108733 A1LIM, Nag-Bok
Most cited
By later US patents
- Rotary fluid machine21US 4,938,670 A1990
- Scroll type fluid displacement apparatus with pressure communicating passage between pockets14US 4,432,708 ASanden Corporation · 1984
- Exhaust energy recovery system for combustion engine7US 7,104,060 B2Toyota Jidosha Kabushiki Kaisha · 2006
- Rotary displacement turbine engine with vacuum relief valve means4US 4,417,859 A1983
- Gear and a fluid machine with a pair of gears3US 6,709,250 B12004