F02B 33/02
Engines with reciprocating-piston pumps
Official title: Engines with reciprocating-piston pumps; Engines with crankcase pumps
F02B33/02 (Engines with reciprocating-piston pumps) appears on 948 US grants and 647 published applications in this corpus.
Search patents in F02B- Granted patents
- 948
- Published applications
- 647
- Assignees
- 239
- Inventors
- 1,066
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 6 | 0 |
| 1978 | 8 | 0 |
| 1979 | 14 | 0 |
| 1980 | 16 | 0 |
| 1981 | 20 | 0 |
| 1982 | 12 | 0 |
| 1983 | 10 | 0 |
| 1984 | 9 | 0 |
| 1985 | 15 | 0 |
| 1986 | 13 | 0 |
| 1987 | 19 | 0 |
| 1988 | 12 | 0 |
| 1989 | 21 | 0 |
| 1990 | 23 | 0 |
| 1991 | 11 | 0 |
| 1992 | 8 | 0 |
| 1993 | 24 | 0 |
| 1994 | 12 | 0 |
| 1995 | 8 | 0 |
| 1996 | 12 | 0 |
| 1997 | 9 | 0 |
| 1998 | 26 | 0 |
| 1999 | 17 | 0 |
| 2000 | 21 | 0 |
| 2001 | 21 | 19 |
| 2002 | 32 | 39 |
| 2003 | 44 | 32 |
| 2004 | 24 | 34 |
| 2005 | 35 | 15 |
| 2006 | 23 | 30 |
| 2007 | 17 | 37 |
| 2008 | 24 | 22 |
| 2009 | 26 | 32 |
| 2010 | 14 | 34 |
| 2011 | 17 | 28 |
| 2012 | 19 | 35 |
| 2013 | 25 | 27 |
| 2014 | 30 | 40 |
| 2015 | 31 | 23 |
| 2016 | 20 | 17 |
| 2017 | 15 | 18 |
| 2018 | 20 | 26 |
| 2019 | 18 | 30 |
| 2020 | 31 | 27 |
| 2021 | 30 | 22 |
| 2022 | 27 | 21 |
| 2023 | 23 | 19 |
| 2024 | 12 | 11 |
| 2025 | 14 | 5 |
| 2026 | 3 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F02B 33/04With simple crankcase pumps, i.e. with the rear face of a non-stepped432
- F02B 33/06With reciprocating-piston pumps other than simple crankcase pumps410
- F02B 33/28Component parts, details or accessories of crankcase pumps, not provided for in186
- F02B 33/26Four-stroke engines characterised by having crankcase pumps60
- F02B 33/24With crankcase pumps other than with reciprocating pistons only16
Recent patents
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- Fuel pump and damper cup thereof3 Feb 2026US 12,540,608 B2Phinia Jersey Holdings LLC
- Opposed-piston internal combustion engine25 Nov 2025US 12,480,439 B2Umu Devising LLC
- Engine control system and methods25 Nov 2025US 12,480,455 B2Arctic Cat Inc.
- Engine braking in a split-cycle engine17 Sep 2026US 2026/0275902 A1Fpt Industrial S.P.A.
- Two-stroke engine and handheld work apparatus23 Jul 2026US 2026/0210286 A1Andreas Stihl AG & CO.KG
- Crankcase scavenged two-stroke engine and handheld power tool2 Apr 2026US 2026/0092554 A1Husqvarna AB
- Engine control system and methods19 Mar 2026US 2026/0078710 A1Arctic Cat Inc.
- A fuel injection arrangement for hand-held powertools23 Oct 2025US 2025/0327433 A1Husqvarna AB
Most cited
By later US patents
- Opposed piston internal combustion engine with inviscid layer sealing470US 9,909,492 B2Prime Group Alliance, LLC · 2018
- Internal combustion engine102US 4,805,571 AHumphrey Cycle Engine Partners, L.P. · 1989
- Internal combustion engine83US 6,279,550 B12001
- Split-cycle air hybrid engine74US 7,353,786 B2Scuderi Group, LLC · 2008
- Cold air super-charged internal combustion engine, working cycle and method69US 6,951,211 B22005