F04C 19/004
Details concerning the operating liquid
Official title: {Details concerning the operating liquid, e.g. nature, separation, cooling, cleaning, control of the supply}
F04C19/004 (Details concerning the operating liquid) appears on 96 US grants and 83 published applications in this corpus.
Search patents in F04C- Granted patents
- 96
- Published applications
- 83
- Assignees
- 45
- Inventors
- 157
- Latest grant
- 3 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 5 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 4 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 0 |
| 2002 | 1 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 4 |
| 2005 | 0 | 5 |
| 2006 | 0 | 0 |
| 2007 | 1 | 3 |
| 2008 | 2 | 6 |
| 2009 | 2 | 3 |
| 2010 | 2 | 2 |
| 2011 | 2 | 3 |
| 2012 | 3 | 2 |
| 2013 | 5 | 4 |
| 2014 | 1 | 9 |
| 2015 | 5 | 6 |
| 2016 | 2 | 6 |
| 2017 | 5 | 4 |
| 2018 | 5 | 1 |
| 2019 | 4 | 2 |
| 2020 | 3 | 3 |
| 2021 | 5 | 9 |
| 2022 | 2 | 2 |
| 2023 | 6 | 4 |
| 2024 | 4 | 3 |
| 2025 | 1 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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
- Sealing soft water recovery apparatus for vacuum pump in vacuum pressure swing adsorption oxygen generation system26 Nov 2024US 12,152,585 B1Shanghai Lifengas Co., Ltd
- Control of operating liquid flow into a liquid ring pump22 Oct 2024US 12,123,412 B2Edwards Technologies Vacuum Engineering (Qingdao) Company Limited
- Valve arrangement17 Sep 2024US 12,092,106 B2
- Simultaneous compressor-expander13 Aug 2026US 2026/0235127 A1
- System and method for cleaning a liquid ring pump system22 May 2025US 2025/0163915 A1Edwards Technologies Vacuum Engineering (Qingdao) Company Limited
- Sealing soft water recovery apparatus for vacuum pump in vacuum pressure swing adsorption oxygen generation system28 Nov 2024US 2024/0392786 A1Shanghai Lifengas Co., Ltd
- Liquid ring rotor11 Jul 2024US 2024/0229816 A9
- Liquid ring rotor25 Apr 2024US 2024/0133394 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
- Locally powered water distillation system28US 7,340,879 B2DEKA Products Limited Partnership · 2008
- Liquid ring flash expander23US 5,722,255 A1998