F04B 23/12
At least one pump being of the rotary-piston positive-displacement type
Official title: at least one pump being of the rotary-piston positive-displacement type
F04B23/12 (At least one pump being of the rotary-piston positive-displacement type) appears on 76 US grants and 54 published applications in this corpus.
Search patents in F04B- Granted patents
- 76
- Published applications
- 54
- Assignees
- 55
- Inventors
- 152
- Latest grant
- 13 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 1 |
| 2002 | 1 | 3 |
| 2003 | 3 | 5 |
| 2004 | 5 | 5 |
| 2005 | 4 | 1 |
| 2006 | 5 | 2 |
| 2007 | 4 | 1 |
| 2008 | 2 | 3 |
| 2009 | 1 | 0 |
| 2010 | 1 | 2 |
| 2011 | 1 | 1 |
| 2012 | 1 | 0 |
| 2013 | 1 | 2 |
| 2014 | 0 | 4 |
| 2015 | 2 | 1 |
| 2016 | 5 | 8 |
| 2017 | 4 | 1 |
| 2018 | 4 | 2 |
| 2019 | 1 | 3 |
| 2020 | 5 | 1 |
| 2021 | 4 | 2 |
| 2022 | 2 | 2 |
| 2023 | 1 | 0 |
| 2024 | 1 | 3 |
| 2025 | 1 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Single-motor, dual-hydraulic-circuit drive system for industrial materials-handling vehicle and method for controlling the same13 Jan 2026US 12,522,487 B2Hyster-Yale Materials Handling, Inc.
- Balanced piston pump for subsea use21 Oct 2025US 12,448,097 B2Y&R Allum Pty Ltd
- Fluid supply system23 Jul 2024US 12,044,179 B2IHI Corporation
- High-pressure fuel pump7 Nov 2023US 11,808,242 B2Robert Bosch GmbH
- Combination metering assembly for filling liquid products into containers6 Dec 2022US 11,518,553 B2Bausch + Ströbel Maschinenfabrik Ilshofen GmbH + Co. KG
- Replaceable Cartridge for Coating System26 Jun 2025US 2025/0205726 A1Transitions Optical, Inc.
- Recirculation gas flow control and distribution module for fuel cells11 Jul 2024US 2024/0234758 A1
- Single-motor, dual-hydraulic-circuit drive system for industrial materials-handling vehicle and method for controlling the same11 Apr 2024US 2024/0116739 A1Hyster-Yale Maximal Forklift (Zhejiang) Co., Ltd.
- Balanced Piston Pump for Subsea Use11 Jan 2024US 2024/0010314 A1Y&R Allum Pty Ltd
- High-Pressure Fuel Pump17 Feb 2022US 2022/0049674 A1Robert Bosch GmbH
Most cited
By later US patents
- Pump94US 6,332,393 B1Hydro-Gear Limited Partnership · 2001
- Pump unit77US 6,425,244 B1Kanzaki Kokyukoki Mfg.Co., Ltd. · 2002
- Pumping and metering system32US 3,946,551 AUnited Technologies Corporation · 1976
- Fuel pump assembly22US 6,142,747 ARobert Bosch GmbH · 2000
- Hydraulic system comprising a main pump and a precompression pump22US 6,997,685 B2Brueninghaus Hydromatik GmbH · 2006