F04B 7/00
Piston machines or pumps characterised by having positively-driven valving
F04B7/00 (Piston machines or pumps characterised by having positively-driven valving) appears on 1,235 US grants and 1,111 published applications in this corpus.
Search patents in F04B- Granted patents
- 1,235
- Published applications
- 1,111
- Assignees
- 637
- Inventors
- 2,028
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 33 | 0 |
| 1977 | 31 | 0 |
| 1978 | 15 | 0 |
| 1979 | 12 | 0 |
| 1980 | 10 | 0 |
| 1981 | 8 | 0 |
| 1982 | 8 | 0 |
| 1983 | 9 | 0 |
| 1984 | 13 | 0 |
| 1985 | 7 | 0 |
| 1986 | 8 | 0 |
| 1987 | 8 | 0 |
| 1988 | 3 | 0 |
| 1989 | 14 | 0 |
| 1990 | 10 | 0 |
| 1991 | 20 | 0 |
| 1992 | 17 | 0 |
| 1993 | 9 | 0 |
| 1994 | 16 | 0 |
| 1995 | 13 | 0 |
| 1996 | 16 | 0 |
| 1997 | 16 | 0 |
| 1998 | 13 | 0 |
| 1999 | 20 | 0 |
| 2000 | 10 | 0 |
| 2001 | 21 | 2 |
| 2002 | 18 | 9 |
| 2003 | 10 | 20 |
| 2004 | 15 | 11 |
| 2005 | 4 | 27 |
| 2006 | 6 | 18 |
| 2007 | 6 | 27 |
| 2008 | 5 | 21 |
| 2009 | 10 | 24 |
| 2010 | 12 | 16 |
| 2011 | 6 | 29 |
| 2012 | 26 | 63 |
| 2013 | 26 | 63 |
| 2014 | 21 | 62 |
| 2015 | 51 | 70 |
| 2016 | 57 | 67 |
| 2017 | 50 | 59 |
| 2018 | 58 | 64 |
| 2019 | 70 | 88 |
| 2020 | 79 | 79 |
| 2021 | 69 | 61 |
| 2022 | 74 | 52 |
| 2023 | 55 | 53 |
| 2024 | 50 | 60 |
| 2025 | 63 | 50 |
| 2026 | 34 | 16 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F04B 7/02The valving being fluid-actuated297
- F04B 7/04In which the valving is performed by pistons and cylinders coacting to280
- F04B 7/0076The members being actuated by electro-magnetic means208
- F04B 7/0003The distribution member forming both the inlet and discharge distributor for one128
- F04B 7/0042Piston machines or pumps characterised by having positively-driven valving: with specific kinematics90
- F04B 7/0019A common distribution member forming a single discharge distributor for a plurality85
- F04B 7/0084Component parts or details specially adapted therefor71
- F04B 7/0057Mechanical driving means therefor56
Recent patents
- Rotating reciprocating piston pump with a barrel cam6 Oct 2026US 12,753,745 B2HTI Technology and Industries, Inc.
- Fluid pump assembly6 Oct 2026US 12,753,748 B2
- Radial piston pump, method for operating a radial piston pump, and steering system15 Sep 2026US 12,736,036 B2Pump Technology Solutions PS GmbH
- Through-hardened valve seat for hydraulic fracturing1 Sep 2026US 12,723,662 B2Apex Industrial LLC
- Controlling suction valves of a fluid pump18 Aug 2026US 12,710,035 B2SPM Oil & Gas Inc.
- Through-Hardened Valve Seat for Hydraulic Fracturing1 Oct 2026US 2026/0298349 A1Apex Industrial LLC
- Reciprocating pump17 Sep 2026US 2026/0275970 A1Becton, Dickinson and Company
- Fluid end17 Sep 2026US 2026/0275971 A1Kerr Machine Co.
- Fluid routing plug17 Sep 2026US 2026/0275972 A1Kerr Machine Co.
- Microfluidic device with positive displacement pump27 Aug 2026US 2026/0249290 A1Quantumdx Group Limited
Most cited
By later US patents
- User interface and monitoring functions for automated peritoneal dialysis systems430US 5,438,510 ADEKA Products Limited Partnership · 1995
- Flow metering cassette and controller403US 4,303,376 ABaxter Travenol Laboratories, Inc. · 1981
- Nonpulsating IV pump and disposable pump chamber393US 4,236,880 AArchibald Development Labs, Inc. · 1980
- Solution pumping system including disposable pump cassette343US 5,062,774 AAbbott Laboratories · 1991
- Solution pumping system with compressible pump cassette325US 5,098,262 AAbbott Laboratories · 1992