F04C 19/00
Rotary-piston pumps with fluid ring or the like, specially adapted for elastic
Official title: Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
F04C19/00 (Rotary-piston pumps with fluid ring or the like, specially adapted for elastic) appears on 231 US grants and 170 published applications in this corpus.
Search patents in F04C- Granted patents
- 231
- Published applications
- 170
- Assignees
- 102
- Inventors
- 335
- Latest grant
- 3 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 1 | 0 |
| 1978 | 4 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 4 | 0 |
| 1982 | 4 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 6 | 0 |
| 1986 | 1 | 0 |
| 1987 | 8 | 0 |
| 1988 | 5 | 0 |
| 1989 | 4 | 0 |
| 1990 | 1 | 0 |
| 1991 | 5 | 0 |
| 1992 | 5 | 0 |
| 1993 | 7 | 0 |
| 1994 | 9 | 0 |
| 1995 | 7 | 0 |
| 1996 | 6 | 0 |
| 1997 | 7 | 0 |
| 1998 | 5 | 0 |
| 1999 | 2 | 0 |
| 2000 | 4 | 0 |
| 2001 | 2 | 1 |
| 2002 | 4 | 2 |
| 2003 | 3 | 1 |
| 2004 | 1 | 6 |
| 2005 | 0 | 6 |
| 2006 | 2 | 3 |
| 2007 | 1 | 9 |
| 2008 | 2 | 10 |
| 2009 | 3 | 4 |
| 2010 | 4 | 3 |
| 2011 | 6 | 10 |
| 2012 | 6 | 6 |
| 2013 | 7 | 7 |
| 2014 | 5 | 12 |
| 2015 | 7 | 8 |
| 2016 | 2 | 11 |
| 2017 | 7 | 5 |
| 2018 | 12 | 12 |
| 2019 | 4 | 6 |
| 2020 | 10 | 8 |
| 2021 | 10 | 14 |
| 2022 | 4 | 6 |
| 2023 | 10 | 9 |
| 2024 | 8 | 7 |
| 2025 | 4 | 3 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- System and method for cleaning a liquid ring pump system3 Mar 2026US 12,565,890 B2Edwards Technologies Vacuum Engineering (Qingdao) Company Limited
- Process for the distillation of isocyanates30 Dec 2025US 12,509,419 B2Covestro Deutschland AG
- Turbomachine provided with a magnetic drive pump14 Oct 2025US 12,442,385 B2Safran Helicopter Engines
- Air compressor17 Jun 2025US 12,331,744 B2
- Control of liquid ring pump7 Jan 2025US 12,188,473 B2Edwards Technologies Vacuum Engineering (Qingdao) Company Limited
- Simultaneous compressor-expander13 Aug 2026US 2026/0235127 A1
- Two-Stage Pump27 Nov 2025US 2025/0361864 A1Truma Gerätetechnik GmbH & Co. KG
- Chemical vapor deposition apparatus26 Jun 2025US 2025/0207256 A1
- System and method for cleaning a liquid ring pump system22 May 2025US 2025/0163915 A1Edwards Technologies Vacuum Engineering (Qingdao) Company Limited
- Air compressor19 Dec 2024US 2024/0418168 A1
Most cited
By later US patents
- Control for liquid ring vacuum pumps94US 4,655,688 AITT Industries, Inc. · 1987
- Liquid ring pumps with hermetically sealed motor rotors52US 7,465,375 B2DEKA Products Limited Partnership · 2008
- Pressurized vapor cycle liquid distillation43US 7,597,784 B2DEKA Products Limited Partnership · 2009
- Vacuum pump system42US 4,699,570 AITT Industries, Inc. · 1987
- Sealing and dynamic operation of a liquid ring pump36US 4,747,752 ASomarakis, Inc. · 1988