F04C 28/12
Using sliding valves
Official title: using sliding valves
F04C28/12 (Using sliding valves) appears on 232 US grants and 138 published applications in this corpus.
Search patents in F04C- Granted patents
- 232
- Published applications
- 138
- Assignees
- 90
- Inventors
- 373
- Latest grant
- 30 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 5 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 5 | 0 |
| 1981 | 2 | 0 |
| 1982 | 3 | 0 |
| 1983 | 3 | 0 |
| 1984 | 1 | 0 |
| 1985 | 11 | 0 |
| 1986 | 12 | 0 |
| 1987 | 4 | 0 |
| 1988 | 5 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 6 | 0 |
| 1992 | 3 | 0 |
| 1993 | 9 | 0 |
| 1994 | 3 | 0 |
| 1995 | 4 | 0 |
| 1996 | 4 | 0 |
| 1997 | 2 | 0 |
| 1998 | 4 | 0 |
| 1999 | 5 | 0 |
| 2000 | 8 | 0 |
| 2001 | 7 | 1 |
| 2002 | 6 | 1 |
| 2003 | 2 | 2 |
| 2004 | 1 | 3 |
| 2005 | 2 | 2 |
| 2006 | 0 | 7 |
| 2007 | 2 | 2 |
| 2008 | 2 | 8 |
| 2009 | 1 | 7 |
| 2010 | 3 | 11 |
| 2011 | 9 | 5 |
| 2012 | 7 | 7 |
| 2013 | 5 | 5 |
| 2014 | 10 | 4 |
| 2015 | 4 | 3 |
| 2016 | 1 | 6 |
| 2017 | 4 | 5 |
| 2018 | 6 | 8 |
| 2019 | 4 | 10 |
| 2020 | 7 | 6 |
| 2021 | 7 | 10 |
| 2022 | 13 | 8 |
| 2023 | 3 | 3 |
| 2024 | 9 | 7 |
| 2025 | 9 | 5 |
| 2026 | 0 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Screw compressor30 Dec 2025US 12,510,075 B2Palladio Compressors S.R.L.
- Volume ratio control system for a compressor30 Sep 2025US 12,429,052 B2Tyco Fire & Security GmbH
- Slide valve for a twin-screw compressor30 Sep 2025US 12,429,053 B2Johnson Controls Air Conditioning and Refrigeration (Wuxi) Co., Ltd.
- Two-stage refrigerant compressor and operation method thereof12 Aug 2025US 12,385,487 B2Fu Sheng Industrial Co., Ltd.
- Self-positioning volume slide control for screw compressor5 Aug 2025US 12,378,962 B1Copeland Industrial LP
- Screw compressor and its slide valve29 Jan 2026US 2026/0028985 A1Carrier Corporation
- Screw compressor and refrigeration apparatus15 Jan 2026US 2026/0016006 A1Daikin Industries, Ltd.
- Screw Compressor23 Oct 2025US 2025/0327448 A1Palladio Compressors S.R.L.
- Compressor and controlling method of volume ratio thereof16 Oct 2025US 2025/0320871 A1Fu Sheng Industrial Co., Ltd.
- Screw compressor12 Jun 2025US 2025/0188930 A1Johnson Controls Tyco IP Holdings LLP
Most cited
By later US patents
- System and method for controlling rotary screw compressors125US 6,450,771 B1Coltec Industries Inc. · 2002
- System and methods for controlling rotary screw compressors122US 5,713,724 AColtec Industries Inc. · 1998
- Process and a device for increasing the efficiency of compression devices92US 5,316,448 ALinde Aktiengesellschaft · 1994
- Scroll type compressor83US 5,074,760 AMitsubishi Jukogyo Kabushiki Kaisha · 1991
- Micro-processor control of a movable slide stop and a movable slide valve in a helical screw rotary compressor with an enconomizer inlet port77US 4,609,329 AFrick Company · 1986