B21K 1/18
Pistons or plungers
Official title: pistons or plungers
B21K1/18 (Pistons or plungers) appears on 84 US grants and 99 published applications in this corpus.
Search patents in B21K- Granted patents
- 84
- Published applications
- 99
- Assignees
- 54
- Inventors
- 188
- Latest grant
- 30 May 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 1 |
| 2002 | 0 | 2 |
| 2003 | 3 | 1 |
| 2004 | 1 | 10 |
| 2005 | 1 | 3 |
| 2006 | 4 | 3 |
| 2007 | 1 | 4 |
| 2008 | 1 | 3 |
| 2009 | 3 | 5 |
| 2010 | 3 | 4 |
| 2011 | 4 | 3 |
| 2012 | 4 | 5 |
| 2013 | 4 | 8 |
| 2014 | 4 | 3 |
| 2015 | 2 | 5 |
| 2016 | 4 | 11 |
| 2017 | 5 | 5 |
| 2018 | 3 | 9 |
| 2019 | 9 | 6 |
| 2020 | 8 | 6 |
| 2021 | 3 | 1 |
| 2022 | 2 | 1 |
| 2023 | 2 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Forming near-net shape single-piece piston blanks30 May 2023US 11,661,903 B2Ks Kolbenschmidt US, Inc.
- Cold-worked brake piston28 Mar 2023US 11,614,135 B2Continental Automotive Technologies GmbH
- Methods for forging a piston blank29 Mar 2022US 11,286,877 B2Ks Kolbenschmidt US, Inc.
- Production method, piston blank, piston and axial piston machine having said piston4 Jan 2022US 11,213,880 B2Schaeffler Technologies AG & Co. KG
- Steel piston2 Nov 2021US 11,162,454 B2Isuzu Motors Limited
- Near-Net Shape Single-Piece Piston Blanks9 Jun 2022US 2022/0178328 A1Ks Kolbenschmidt US, Inc.
- Steel piston26 Aug 2021US 2021/0262412 A1Isuzu Motors Limited
- Production method, piston blank, piston and axial piston machine having said piston5 Nov 2020US 2020/0346278 A1Schaeffler Technologies AG & Co. KG
- Cold Worked Steel Brake Piston For A Motor Vehicle Partially Lined Disc Brake13 Aug 2020US 2020/0256413 A1Continental Teves AG & Co. oHG
- Cold-worked brake piston11 Jun 2020US 2020/0182319 A1Continental Teves AG & Co. oHG
Most cited
By later US patents
- Method of making a piston bottom27US 4,532,686 ABerchem & Schaberg GmbH · 1985
- Method for manufacturing a swaged piston assembly for an automotive air conditioning compressor25US 5,218,763 AGeneral Motors Corporation · 1993
- Piston assembly and piston member thereof having a predetermined compression height to diameter ratio24US 5,040,454 ACaterpillar Inc. · 1991
- Method of making a one-piece piston for an internal-combustion engine23US 4,662,047 ABerchem & Schaberg GmbH · 1987
- Method for manufacturing a piston rod unit21US 4,419,804 AFichtel & Sachs AG · 1983