F04B
Positive-displacement machines for liquids
Official title: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F)
F04B (Positive-displacement machines for liquids) appears on 30,311 US grants and 27,580 published applications in this corpus.
Search patents in F04B- Granted patents
- 30,311
- Published applications
- 27,580
- Assignees
- 8,789
- Inventors
- 44,563
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 369 | 0 |
| 1977 | 294 | 0 |
| 1978 | 293 | 0 |
| 1979 | 199 | 0 |
| 1980 | 237 | 0 |
| 1981 | 240 | 0 |
| 1982 | 244 | 0 |
| 1983 | 289 | 0 |
| 1984 | 352 | 0 |
| 1985 | 401 | 0 |
| 1986 | 272 | 0 |
| 1987 | 296 | 0 |
| 1988 | 354 | 0 |
| 1989 | 362 | 0 |
| 1990 | 312 | 0 |
| 1991 | 376 | 0 |
| 1992 | 389 | 0 |
| 1993 | 423 | 0 |
| 1994 | 375 | 0 |
| 1995 | 318 | 0 |
| 1996 | 424 | 0 |
| 1997 | 399 | 0 |
| 1998 | 470 | 0 |
| 1999 | 510 | 0 |
| 2000 | 645 | 0 |
| 2001 | 716 | 196 |
| 2002 | 645 | 612 |
| 2003 | 695 | 730 |
| 2004 | 549 | 929 |
| 2005 | 438 | 924 |
| 2006 | 478 | 891 |
| 2007 | 432 | 770 |
| 2008 | 435 | 924 |
| 2009 | 393 | 945 |
| 2010 | 492 | 1018 |
| 2011 | 536 | 916 |
| 2012 | 720 | 961 |
| 2013 | 764 | 1241 |
| 2014 | 804 | 1285 |
| 2015 | 841 | 1372 |
| 2016 | 928 | 1266 |
| 2017 | 1056 | 1398 |
| 2018 | 1134 | 1408 |
| 2019 | 1334 | 1407 |
| 2020 | 1305 | 1427 |
| 2021 | 1229 | 1450 |
| 2022 | 1209 | 1252 |
| 2023 | 1168 | 1229 |
| 2024 | 1181 | 1217 |
| 2025 | 1177 | 1044 |
| 2026 | 809 | 768 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Main groups
Granted patents with any code in the group
- F04B 49/00Control7,182
- F04B 53/00Component parts, details or accessories not provided for in, or of interest6,424
- F04B 43/00Machines, pumps, or pumping installations having flexible working members5,437
- F04B 39/00Component parts, details, or accessories, of pumps or pumping systems specially adapted5,272
- F04B 1/00Multi-cylinder machines or pumps characterised by number or arrangement of cylinders3,681
- F04B 17/00Pumps characterised by combination with, or adaptation to, specific driving engines or3,676
- F04B 9/00Piston machines or pumps characterised by the driving or driven means to2,903
- F04B 35/00Piston pumps specially adapted for elastic fluids and characterised by the driving2,714
All 30 main groupsShow fewer
- F04B 27/00Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or2,245
- F04B 23/00Pumping installations or systems2,244
- F04B 47/00Pumps or pumping installations specially adapted for raising fluids from great depths2,089
- F04B 19/00Machines or pumps having pertinent characteristics not provided for in, or of1,865
- F04B 2205/00Fluid parametersIndexing code1,720
- F04B 15/00Pumps adapted to handle specific fluids1,396
- F04B 2201/00Pump parametersIndexing code1,313
- F04B 2203/00Motor parametersIndexing code1,282
- F04B 7/00Piston machines or pumps characterised by having positively-driven valving1,235
- F04B 45/00Pumps or pumping installations having flexible working members and specially adapted for1,159
- F04B 37/00Pumps having pertinent characteristics not provided for in, or of interest apart1,009
- F04B 41/00Pumping installations or systems specially adapted for elastic fluids1,005
- F04B 13/00Pumps specially modified to deliver fixed or variable measured quantities973
- F04B 51/00Testing machines, pumps, or pumping installations949
- F04B 11/00Equalisation of pulses768
- F04B 33/00Pumps actuated by muscle power553
- F04B 2207/00External parametersIndexing code469
- F04B 25/00Multi-stage pumps372
- F04B 5/00Machines or pumps with differential-surface pistons250
- F04B 3/00Machines or pumps with pistons coacting within one cylinder131
- F04B 31/00Free-piston pumps specially adapted for elastic fluids39
- F04B 29/00Positive-displacement machines for liquids: other pumps with movable19
Recent patents
- Method and apparatus for delivering an API-containing liquid to an edible substrate6 Oct 2026US 12,751,915 B2Transport Authority, Inc.
- Pumping device6 Oct 2026US 12,752,291 B2Tianzhou Medical (Suzhou) Co., Ltd
- Rotating reciprocating piston pump with a barrel cam6 Oct 2026US 12,753,745 B2HTI Technology and Industries, Inc.
- Long stroke parallel pump6 Oct 2026US 12,753,746 B2National Oilwell Varco, L. P.
- Electric cylinder device6 Oct 2026US 12,753,747 B2Advics Co., Ltd.
- Implantable electromagnetic pumps8 Oct 2026US 2026/0306297 A1Verily Health Inc.
- Modular multiplatform system for mrna drug production8 Oct 2026US 2026/0306407 A1BioNTech SE
- Pumping system and method for home healthcare devices8 Oct 2026US 2026/0306727 A1
- Pump and accessory assembly integrated into a bicycle seatpost8 Oct 2026US 2026/0307436 A1
- Washing machine8 Oct 2026US 2026/0308830 A1Samsung Electronics Co., Ltd.
Most cited
By later US patents
- Electroactive polymer devices1,577US 6,545,384 B1SRI International · 2003
- Self-adjusting pump head and safety manifold cartridge for a peristaltic pump1,565US 5,447,417 AValleylab, Inc. · 1995
- Electroactive polymer electrodes1,515US 6,583,533 B2SRI International · 2003
- Hose pump for the exact dosing of small quantities of liquids1,512US 5,693,020 ALoctite Europa E.E.I.G. (E.W.I.V.) · 1997
- Drug pump systems and methods1,088US 5,935,099 ASIMS Deltec, Inc. · 1999