F04C 18/48
Rotary-piston pumps with non-parallel axes of movement of co-operating members
F04C18/48 (Rotary-piston pumps with non-parallel axes of movement of co-operating members) appears on 111 US grants and 109 published applications in this corpus.
Search patents in F04C- Granted patents
- 111
- Published applications
- 109
- Assignees
- 34
- Inventors
- 104
- Latest grant
- 10 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 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 | 3 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 3 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 1 | 3 |
| 2006 | 1 | 2 |
| 2007 | 0 | 1 |
| 2008 | 0 | 2 |
| 2009 | 0 | 1 |
| 2010 | 2 | 14 |
| 2011 | 1 | 5 |
| 2012 | 5 | 7 |
| 2013 | 10 | 4 |
| 2014 | 6 | 4 |
| 2015 | 9 | 1 |
| 2016 | 4 | 2 |
| 2017 | 1 | 4 |
| 2018 | 3 | 2 |
| 2019 | 6 | 8 |
| 2020 | 3 | 10 |
| 2021 | 7 | 9 |
| 2022 | 6 | 6 |
| 2023 | 6 | 6 |
| 2024 | 11 | 6 |
| 2025 | 7 | 6 |
| 2026 | 1 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Low ratio oil injection port for applications without the requirement of an oil pump10 Feb 2026US 12,546,316 B1Copeland Industrial LP
- Screw compressor and refrigeration apparatus25 Nov 2025US 12,480,492 B2Daikin Industries, Ltd.
- Screw compressor and refrigeration apparatus7 Oct 2025US 12,435,719 B2Daikin Industries, Ltd.
- Single screw compressor30 Sep 2025US 12,429,051 B2Paralloid Gear Co., Ltd.
- Method for manufacturing screw rotor12 Aug 2025US 12,383,966 B2Daikin Industries, Ltd.
- Hermetic compressor and refrigeration cycle apparatus30 Jul 2026US 2026/0218707 A1Mitsubishi Electric Corporation
- Low ratio oil injection port for applications without the requirement of an oil pump12 Feb 2026US 2026/0043404 A1Copeland Industrial LP
- Screw compressor22 Jan 2026US 2026/0022701 A1Daikin Industries, Ltd.
- Screw compressor and refrigeration apparatus15 Jan 2026US 2026/0016006 A1Daikin Industries, Ltd.
- Screw compressor8 Jan 2026US 2026/0009383 A1Daikin Industries, Ltd.
Most cited
By later US patents
- Rotary screw gas compressor having dual slide valves26US 4,610,612 AVilter Manufacturing Corporation · 1986
- Vacuum cleaners especially quiet vacuum cleaners, pumps, and engines24US 8,272,854 B22012
- Control means for gas compressor having dual slide valves22US 4,610,613 AVilter Manufacturing Corporation · 1986
- Method for operating dual slide valve rotary gas compressor22US 4,704,069 AVilter Manufacturing Corporation · 1987
- Worm-type rotary fluid compressor14US 4,373,881 AIwata Air Compressor Manufacturing Company Ltd. · 1983