F04C
Rotary-piston, or oscillating-piston, positive-displacement machines for liquids
Official title: Rotary-piston, or oscillating-piston, positive-displacement machines for liquids (engines f03c); rotary-piston, or oscillating-piston, positive-displacement pumps
F04C (Rotary-piston, or oscillating-piston, positive-displacement machines for liquids) appears on 15,562 US grants and 13,808 published applications in this corpus.
Search patents in F04C- Granted patents
- 15,562
- Published applications
- 13,808
- Assignees
- 3,836
- Inventors
- 20,684
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 92 | 0 |
| 1977 | 88 | 0 |
| 1978 | 86 | 0 |
| 1979 | 59 | 0 |
| 1980 | 106 | 0 |
| 1981 | 101 | 0 |
| 1982 | 98 | 0 |
| 1983 | 127 | 0 |
| 1984 | 162 | 0 |
| 1985 | 209 | 0 |
| 1986 | 164 | 0 |
| 1987 | 169 | 0 |
| 1988 | 174 | 0 |
| 1989 | 192 | 0 |
| 1990 | 187 | 0 |
| 1991 | 224 | 0 |
| 1992 | 224 | 0 |
| 1993 | 241 | 0 |
| 1994 | 234 | 0 |
| 1995 | 207 | 0 |
| 1996 | 235 | 0 |
| 1997 | 209 | 0 |
| 1998 | 245 | 0 |
| 1999 | 184 | 0 |
| 2000 | 374 | 0 |
| 2001 | 367 | 90 |
| 2002 | 323 | 315 |
| 2003 | 335 | 337 |
| 2004 | 281 | 400 |
| 2005 | 195 | 416 |
| 2006 | 247 | 393 |
| 2007 | 213 | 335 |
| 2008 | 203 | 422 |
| 2009 | 227 | 439 |
| 2010 | 245 | 502 |
| 2011 | 279 | 416 |
| 2012 | 357 | 545 |
| 2013 | 375 | 815 |
| 2014 | 431 | 980 |
| 2015 | 574 | 966 |
| 2016 | 621 | 690 |
| 2017 | 692 | 677 |
| 2018 | 709 | 773 |
| 2019 | 670 | 672 |
| 2020 | 630 | 717 |
| 2021 | 606 | 607 |
| 2022 | 619 | 529 |
| 2023 | 540 | 515 |
| 2024 | 661 | 480 |
| 2025 | 500 | 450 |
| 2026 | 271 | 327 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Main groups
Granted patents with any code in the group
- F04C 18/00Rotary-piston pumps specially adapted for elastic fluids5,895
- F04C 29/00Component parts, details or accessories of pumps or pumping installations, not provided5,208
- F04C 2/00Rotary-piston machines or pumps3,974
- F04C 2240/00ComponentsIndexing code3,914
- F04C 23/00Combinations of two or more pumps, each being of rotary-piston or oscillating-piston3,315
- F04C 2270/00ControlIndexing code2,943
- F04C 15/00Component parts, details or accessories of machines, pumps or pumping installations, not2,651
- F04C 28/00Control of, monitoring of, or safety arrangements for, pumps or pumping installations2,126
All 24 main groupsShow fewer
- F04C 14/00Control of, monitoring of, or safety arrangements for, machines, pumps or pumping1,556
- F04C 2230/00ManufactureIndexing code1,406
- F04C 27/00Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids1,147
- F04C 2210/00FluidIndexing code979
- F04C 11/00Combinations of two or more machines or pumps, each being of rotary-piston822
- F04C 13/00Adaptations of machines or pumps for special use783
- F04C 2250/00GeometryIndexing code624
- F04C 25/00Adaptations of pumps for special use of pumps for elastic fluids418
- F04C 2220/00ApplicationIndexing code410
- F04C 19/00Rotary-piston pumps with fluid ring or the like, specially adapted for elastic231
- F04C 5/00Rotary-piston machines or pumps with the working-chamber walls at least partly resiliently133
- F04C 3/00Rotary-piston machines or pumps, with non-parallel axes of movement of co-operating members73
- F04C 2280/00Arrangements for preventing or removing deposits or corrosionIndexing code66
- F04C 9/00Oscillating-piston machines or pumps66
- F04C 21/00Oscillating-piston pumps specially adapted for elastic fluids36
- F04C 7/00Rotary-piston machines or pumps with fluid ring or the like16
Recent patents
- Process pump with dynamic seal for dry run capability6 Oct 2026US 12,753,757 B2Viking Pump, Inc.
- Fluid pump for an aircraft turbomachine, lubrication circuit and aircraft turbomachine6 Oct 2026US 12,753,758 B2Safran Aero Boosters SA
- Pump6 Oct 2026US 12,753,759 B2LG Innotek Co., Ltd.
- Rotary compressor and refrigeration cycle device having the same6 Oct 2026US 12,753,760 B2LG Electronics Inc.
- Scroll-type electric compressor6 Oct 2026US 12,753,761 B2Sanden Corporation
- Rotary internal combustion engine with integrated pump8 Oct 2026US 2026/0309074 A1Pratt & Whitney Canada Corp.
- Improved Positive-Displacement Rotary Hydraulic Machine8 Oct 2026US 2026/0309149 A1Stem Numerical Engineering S.R.L.
- Screw spindle pump8 Oct 2026US 2026/0309150 A1Leistritz Pumpen GmbH
- Scroll compressor with a sealing ring for a fixed disk check valve8 Oct 2026US 2026/0309151 A1Hitachi-Johnson Controls Air Conditioning, Inc.
- Pump8 Oct 2026US 2026/0309152 A1Gebr. Becker GmbH
Most cited
By later US patents
- Robotically-controlled surgical stapling devices that produce formed staples having different lengths2,060US 9,237,891 B2Ethicon Endo-Surgery, Inc. · 2016
- Surgical instrument having a multiple rate directional switching mechanism1,717US 8,534,528 B2Ethicon Endo-Surgery, Inc. · 2013
- Tissue thickness compensator comprising a plurality of medicaments1,690US 9,211,120 B2Ethicon Endo-Surgery, Inc. · 2015
- Surgical instruments with fluid management system1,587US 9,283,045 B2Ethicon Endo-Surgery, Inc. · 2016
- Tissue thickness compensator comprising structure to produce a resilient load1,522US 9,220,500 B2Ethicon Endo-Surgery, Inc. · 2015