F04B 1/0421
Cylinders
F04B1/0421 (Cylinders) appears on 216 US grants and 201 published applications in this corpus.
Search patents in F04B- Granted patents
- 216
- Published applications
- 201
- Assignees
- 116
- Inventors
- 394
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 3 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 5 | 0 |
| 2001 | 10 | 4 |
| 2002 | 9 | 3 |
| 2003 | 5 | 2 |
| 2004 | 3 | 3 |
| 2005 | 2 | 4 |
| 2006 | 1 | 3 |
| 2007 | 1 | 7 |
| 2008 | 0 | 8 |
| 2009 | 1 | 6 |
| 2010 | 9 | 10 |
| 2011 | 4 | 5 |
| 2012 | 4 | 7 |
| 2013 | 9 | 14 |
| 2014 | 5 | 12 |
| 2015 | 14 | 7 |
| 2016 | 10 | 12 |
| 2017 | 6 | 9 |
| 2018 | 8 | 9 |
| 2019 | 11 | 8 |
| 2020 | 11 | 13 |
| 2021 | 8 | 4 |
| 2022 | 12 | 5 |
| 2023 | 9 | 15 |
| 2024 | 8 | 13 |
| 2025 | 15 | 12 |
| 2026 | 12 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Fuel pump15 Sep 2026US 12,736,034 B2Mitsubishi Heavy Industries Engine & Turbocharger, Ltd.
- Fluid end block and fluid end for a multiplex piston pump having multiple inlet passages15 Sep 2026US 12,736,035 B2
- Radial piston pump, method for operating a radial piston pump, and steering system15 Sep 2026US 12,736,036 B2Pump Technology Solutions PS GmbH
- Fluid end assembly18 Aug 2026US 12,710,039 B2Kerr Machine Co.
- Radial piston pump, and process for manufacturing a radial piston pump11 Aug 2026US 12,704,123 B2thyssenkrupp AG
- Fluid end block and fluid end for a multiplex piston pump having multiple inlet passages20 Aug 2026US 2026/0243239 A1
- Compact opposed pump23 Jul 2026US 2026/0210342 A1Cummins-Scania HPCR System, LLC
- Stationary plunger packing25 Jun 2026US 2026/0177054 A1Halliburton Energy Services.Inc.
- High performance sealing assembly18 Jun 2026US 2026/0168490 A1Vulcan Industrial Holdings, LLC
- Wear ring for a fluid end cartridge28 May 2026US 2026/0146600 A1SPM Oil & Gas Inc.
Most cited
By later US patents
- Radial piston fluid machine and/or adjustable rotor116US 5,634,777 A1997
- Hydraulic unit for slip-controlled braking systems99US 8,500,215 B2Continental Teves AG & Co. oHG · 2013
- Pump gear99US 9,097,249 B2Bran & Luebbe GmbH · 2015
- Fluid cylinder block having a stress distributing joint67US 9,188,121 B1Forum US, Inc. · 2015
- Fuel pump assembly62US 8,708,667 B2Delphi International Operations Luxemboug S.A.R.L. · 2014