F02B 33/04
With simple crankcase pumps, i.e. with the rear face of a non-stepped
Official title: with simple crankcase pumps, i.e. with the rear face of a non-stepped working piston acting as sole pumping member in co-operation with the crankcase
F02B33/04 (With simple crankcase pumps, i.e. with the rear face of a non-stepped) appears on 432 US grants and 243 published applications in this corpus.
Search patents in F02B- Granted patents
- 432
- Published applications
- 243
- Assignees
- 104
- Inventors
- 528
- Latest grant
- 25 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 5 | 0 |
| 1978 | 3 | 0 |
| 1979 | 9 | 0 |
| 1980 | 9 | 0 |
| 1981 | 13 | 0 |
| 1982 | 5 | 0 |
| 1983 | 8 | 0 |
| 1984 | 2 | 0 |
| 1985 | 5 | 0 |
| 1986 | 7 | 0 |
| 1987 | 9 | 0 |
| 1988 | 5 | 0 |
| 1989 | 9 | 0 |
| 1990 | 14 | 0 |
| 1991 | 7 | 0 |
| 1992 | 3 | 0 |
| 1993 | 9 | 0 |
| 1994 | 5 | 0 |
| 1995 | 3 | 0 |
| 1996 | 7 | 0 |
| 1997 | 3 | 0 |
| 1998 | 17 | 0 |
| 1999 | 7 | 0 |
| 2000 | 17 | 0 |
| 2001 | 16 | 12 |
| 2002 | 23 | 31 |
| 2003 | 32 | 23 |
| 2004 | 12 | 18 |
| 2005 | 23 | 8 |
| 2006 | 12 | 14 |
| 2007 | 9 | 9 |
| 2008 | 6 | 7 |
| 2009 | 8 | 6 |
| 2010 | 5 | 6 |
| 2011 | 3 | 9 |
| 2012 | 5 | 5 |
| 2013 | 3 | 6 |
| 2014 | 6 | 9 |
| 2015 | 12 | 8 |
| 2016 | 2 | 5 |
| 2017 | 5 | 6 |
| 2018 | 9 | 9 |
| 2019 | 4 | 11 |
| 2020 | 14 | 10 |
| 2021 | 10 | 5 |
| 2022 | 6 | 6 |
| 2023 | 10 | 8 |
| 2024 | 6 | 6 |
| 2025 | 7 | 3 |
| 2026 | 0 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Engine control system and methods25 Nov 2025US 12,480,455 B2Arctic Cat Inc.
- Two-stroke engine with crankcase fuel injector30 Sep 2025US 12,429,020 B2
- Engine control system and methods22 Jul 2025US 12,366,222 B2Arctic Cat Inc.
- Two stroke charge piston engine6 May 2025US 12,291,993 B1
- Internal combustion engine and lubrication system thereof29 Apr 2025US 12,286,924 B2Brp-Rotax GmbH & Co. KG
- 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
- Air intake-type two-stroke engine26 Jun 2025US 2025/0207527 A1Yamabiko Corporation
Most cited
By later US patents
- Internal combustion engine102US 4,805,571 AHumphrey Cycle Engine Partners, L.P. · 1989
- Two cycle internal combustion engines58US 4,075,985 AYamaha Hatsudoki Kabushiki Kaisha · 1978
- Stratified-charge two-stroke internal combustion engines42US 4,253,433 AThe Queen's University of Belfast · 1981
- Fuel delivery system for hand-held two-stroke cycle engines41US 5,682,845 AWalbro Corporation · 1997
- Two-cycle engine with pure air scavenging39US 4,248,185 A1981