B21K 21/08
Shaping hollow articles with different cross-section in longitudinal direction
Official title: Shaping hollow articles with different cross-section in longitudinal direction, e.g. nozzles, spark-plugs
B21K21/08 (Shaping hollow articles with different cross-section in longitudinal direction) appears on 112 US grants and 76 published applications in this corpus.
Search patents in B21K- Granted patents
- 112
- Published applications
- 76
- Assignees
- 83
- Inventors
- 187
- Latest grant
- 23 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
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| 1999 | 1 | 0 |
| 2000 | 7 | 0 |
| 2001 | 3 | 1 |
| 2002 | 3 | 4 |
| 2003 | 3 | 10 |
| 2004 | 5 | 5 |
| 2005 | 2 | 2 |
| 2006 | 2 | 3 |
| 2007 | 4 | 2 |
| 2008 | 3 | 4 |
| 2009 | 1 | 2 |
| 2010 | 2 | 1 |
| 2011 | 1 | 3 |
| 2012 | 5 | 3 |
| 2013 | 1 | 1 |
| 2014 | 3 | 6 |
| 2015 | 3 | 5 |
| 2016 | 6 | 4 |
| 2017 | 7 | 4 |
| 2018 | 1 | 3 |
| 2019 | 1 | 2 |
| 2020 | 5 | 3 |
| 2021 | 0 | 2 |
| 2022 | 2 | 2 |
| 2023 | 3 | 0 |
| 2024 | 4 | 2 |
| 2025 | 3 | 1 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Device and method for continuously producing an at least partly hollow shaft having a varying inner and/or outer diameter23 Dec 2025US 12,502,705 B2MAGNA Powertrain AG & Co KG
- Material dispense tips20 May 2025US 12,303,929 B1DL Technology, LLC.
- Extrusion molding method for differential thickness pipe and extrusion molding apparatus for differential thickness pipe4 Feb 2025US 12,214,395 B2Sango Co., Ltd.
- Material dispense tips25 Jun 2024US 12,017,247 B1DL Technology, LLC.
- Metal assembled body16 Apr 2024US 11,958,136 B2Daicel Corporation
- Extrusion molding method and extrusion molding apparatus of a differential thickness pipe having a solid part25 Jun 2026US 2026/0175277 A1Sango Co., Ltd.
- Fitting and Method of Making the Same2 Oct 2025US 2025/0305603 A1Indimet Inc.
- Device and method for continuously producing an at least partly hollow shaft having a varying inner and/or outer diameter6 Jun 2024US 2024/0181515 A1MAGNA Powertrain AG & Co KG
- Spray tip design and manufacture14 Mar 2024US 2024/0082860 A1Wagner Spray Tech Corporation
- Extrusion molding method for differential thickness pipe and extrusion molding apparatus for differential thickness pipe6 Oct 2022US 2022/0314290 A1Sango Co., Ltd.
Most cited
By later US patents
- Cold forming dies and cold forming process57US 4,945,749 AGeneral Motors Corporation · 1990
- Method and apparatus for producing a stepped hollow article53US 4,580,431 AHitachi, Ltd. · 1986
- Reinforcement for vehicle hollow structural member, having decreasing-thickness end portions50US 6,082,811 AKyoho Machine Works, Ltd. · 2000
- Method of making a male resistance welding electrode44US 4,423,617 AThe Nippert Company · 1984
- Process and apparatus for producing an electrical battery pole or terminal42US 4,776,197 AAquila Piombo per Caccia e Tiro S.r.l. · 1988