B21C 37/16
Making tubes with varying diameter in longitudinal direction
B21C37/16 (Making tubes with varying diameter in longitudinal direction) appears on 202 US grants and 179 published applications in this corpus.
Search patents in B21C- Granted patents
- 202
- Published applications
- 179
- Assignees
- 149
- Inventors
- 425
- Latest grant
- 16 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 4 | 0 |
| 1985 | 3 | 0 |
| 1986 | 7 | 0 |
| 1987 | 2 | 0 |
| 1988 | 5 | 0 |
| 1989 | 1 | 0 |
| 1990 | 3 | 0 |
| 1991 | 3 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 4 | 0 |
| 1995 | 1 | 0 |
| 1996 | 8 | 0 |
| 1997 | 1 | 0 |
| 1998 | 3 | 0 |
| 1999 | 5 | 0 |
| 2000 | 4 | 0 |
| 2001 | 3 | 1 |
| 2002 | 4 | 8 |
| 2003 | 4 | 9 |
| 2004 | 9 | 10 |
| 2005 | 6 | 12 |
| 2006 | 5 | 10 |
| 2007 | 6 | 12 |
| 2008 | 8 | 8 |
| 2009 | 3 | 1 |
| 2010 | 4 | 6 |
| 2011 | 3 | 9 |
| 2012 | 3 | 4 |
| 2013 | 4 | 6 |
| 2014 | 2 | 4 |
| 2015 | 6 | 12 |
| 2016 | 11 | 5 |
| 2017 | 2 | 5 |
| 2018 | 6 | 6 |
| 2019 | 6 | 10 |
| 2020 | 6 | 4 |
| 2021 | 7 | 11 |
| 2022 | 5 | 11 |
| 2023 | 9 | 9 |
| 2024 | 6 | 4 |
| 2025 | 8 | 2 |
| 2026 | 3 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Additive manufacturing of multilayered structures16 Jun 2026US 12,654,417 B2FMC Technologies, Inc.
- Pipe for chromatograph and method of manufacturing pipe for chromatograph26 May 2026US 12,638,425 B2Shimadzu Corporation
- Spiral forming19 May 2026US 12,629,738 B2Keystone Tower Systems, Inc.
- 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
- Expanded tube for a motor vehicle crash box and manufacturing method for it19 Aug 2025US 12,391,201 B2Outokumpu Oyj
- Additive manufacturing of multilayered structures23 Oct 2025US 2025/0326197 A1FMC Technologies, Inc.
- Extrusion molding method of differential thickness pipe and extrusion molding apparatus of differential thickness pipe1 May 2025US 2025/0135518 A1Sango Co., Ltd.
- Pipe for chromatograph and method of manufacturing pipe for chromatograph26 Sep 2024US 2024/0319149 A1Shimadzu Corporation
- 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
- Variable thickness extrusion for variable extrudate product properties14 Mar 2024US 2024/0082896 A1Battelle Memorial Institute
Most cited
By later US patents
- Deformable member175US 6,896,049 B2Zeroth Technology Ltd. · 2005
- Hydroformed tubular member and method of hydroforming tubular members48US 6,216,509 B1R. J. Tower Corporation · 2001
- Metal pipe having upset ends44US 5,743,301 AShaw Industries Ltd. · 1998
- Method for making upset ends on metal pipe and resulting product42US 5,517,843 AShaw Industries Ltd. · 1996
- α-β titanium alloy tubes and methods of flowforming the same35US 7,601,232 B2Dynamic Flowform Corp. · 2009