F04C 27/02
Liquid sealing for high-vacuum pumps or for compressors
Official title: Liquid sealing for high-vacuum pumps {or for compressors}
F04C27/02 (Liquid sealing for high-vacuum pumps or for compressors) appears on 58 US grants and 56 published applications in this corpus.
Search patents in F04C- Granted patents
- 58
- Published applications
- 56
- Assignees
- 47
- Inventors
- 121
- Latest grant
- 10 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 3 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 1 | 2 |
| 2007 | 1 | 0 |
| 2008 | 0 | 3 |
| 2009 | 0 | 1 |
| 2010 | 2 | 2 |
| 2011 | 0 | 1 |
| 2012 | 1 | 3 |
| 2013 | 5 | 1 |
| 2014 | 0 | 2 |
| 2015 | 1 | 3 |
| 2016 | 3 | 5 |
| 2017 | 1 | 5 |
| 2018 | 4 | 0 |
| 2019 | 2 | 4 |
| 2020 | 3 | 2 |
| 2021 | 1 | 5 |
| 2022 | 4 | 3 |
| 2023 | 8 | 9 |
| 2024 | 2 | 2 |
| 2025 | 1 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Vacuum pumping system having an oil-lubricated vacuum pump10 Mar 2026US 12,571,393 B2Agilent Technologies, Inc.
- Dry-compression compressor and method for oil separation for a dry-compression compressor4 Nov 2025US 12,460,643 B2Kaeser Kompressoren SE
- Vacuum pump system and method for operating a vacuum pump system12 Nov 2024US 12,140,146 B2Leybold Aktiengesellschaft
- Vacuum pump lubricant recovery system returning lubricant from the air filter based on pressure measurements in the vacuum pump1 Oct 2024US 12,104,597 B2Atlas Copco Airpower N.V.
- Water-ring vacuum pump including built-in hogging flow path28 Nov 2023US 11,828,286 B2Vaccomp Co., Ltd.
- Vacuum pump1 Oct 2026US 2026/0298238 A1Pfeiffer Vacuum GmbH
- Rotary motor with integral fluid seal27 Nov 2025US 2025/0361808 A1Coool.Energy Ltd
- Dry-compression compressor and method for oil separation for a dry-compression compressor11 Jul 2024US 2024/0229794 A1Kaeser Kompressoren SE
- Rotary vane vacuum pump with gas ballast assembly7 Mar 2024US 2024/0077078 A1
- Air extractor23 Nov 2023US 2023/0375007 A1Zhejiang University
Most cited
By later US patents
- Liquid sealed vane oscillators26US 5,115,157 ATechnion Research & Development Foundation Limited · 1992
- Cooling structure for an oil sealed rotary vacuum pump25US 4,283,167 AVarian Associates, Inc. · 1981
- Modular vacuum pump assembly24US 4,123,201 ACentral Scientific Company, Inc. · 1978
- Oil flow metering structure for oil sealed mechanical vacuum vane pump13US 4,276,005 AVarian Associates, Inc. · 1981
- Scroll-type vacuum pump with oil seal between suction and discharge chambers12US 4,735,559 AMitsubishi Denki Kabushiki Kaisha · 1988