B21D 9/01
The mandrel being flexible and engaging the entire tube length
Official title: the mandrel being flexible and engaging the entire tube length
B21D9/01 (The mandrel being flexible and engaging the entire tube length) appears on 82 US grants and 50 published applications in this corpus.
Search patents in B21D- Granted patents
- 82
- Published applications
- 50
- Assignees
- 62
- Inventors
- 153
- Latest grant
- 25 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 4 | 0 |
| 1986 | 0 | 0 |
| 1987 | 3 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 5 | 0 |
| 2001 | 2 | 1 |
| 2002 | 1 | 0 |
| 2003 | 1 | 1 |
| 2004 | 0 | 2 |
| 2005 | 1 | 0 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 1 | 3 |
| 2009 | 1 | 1 |
| 2010 | 0 | 0 |
| 2011 | 0 | 3 |
| 2012 | 3 | 1 |
| 2013 | 0 | 3 |
| 2014 | 3 | 1 |
| 2015 | 1 | 3 |
| 2016 | 1 | 4 |
| 2017 | 2 | 3 |
| 2018 | 5 | 4 |
| 2019 | 4 | 1 |
| 2020 | 3 | 2 |
| 2021 | 0 | 3 |
| 2022 | 9 | 5 |
| 2023 | 1 | 2 |
| 2024 | 2 | 3 |
| 2025 | 6 | 4 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Bending mandril comprising ultra high molecular weight material, related bending machines, systems, and methods25 Nov 2025US 12,479,019 B2Manufacturing Resources International, Inc.
- Device for the internal bending of pipes for pipelines28 Oct 2025US 12,453,998 B2Bendforce GmbH
- Bending mandril comprising ultra high molecular weight material, related bending machines, systems, and methods8 Jul 2025US 12,350,730 B1Manufacturing Resources International, Inc.
- Apparatus and method for bending heat exchanger10 Jun 2025US 12,325,058 B2Sanhua (Hangzhou) Micro Channel Heat Exchanger Co., Ltd.
- Mandrel for pipe bending machine27 May 2025US 12,311,430 B2Cml International S. P. A
- Mandrel assembly for a tube bending machine27 Nov 2025US 2025/0360548 A1Blm S.P.A.
- Bending mandril comprising ultra high molecular weight material, related bending machines, systems, and methods2 Oct 2025US 2025/0303457 A1Manufacturing Resources International, Inc.
- Bending mandril comprising ultra high molecular weight material, related bending machines, systems, and methods3 Jul 2025US 2025/0214128 A1Manufacturing Resources International, Inc.
- Tube Mandrel and Methods for Forming a Tube20 Mar 2025US 2025/0091300 A1Celanese International Corporation
- Push-bending forming device and method for titanium alloy tubes5 Dec 2024US 2024/0399436 A1Nanchang Hangkong University
Most cited
By later US patents
- Mandrel assembly for tube-bending apparatus29US 6,155,091 AArvin Industries, Inc. · 2000
- Pipe bending mandrel26US 4,086,803 ACRC-Crose International, Inc. · 1978
- Rotary compression bending machine24US 4,524,599 A1985
- Apparatus for bending rectangular tubes24US 4,744,233 AAP Industries, Inc. · 1988
- Tube bending mandrel22US 6,085,572 ATube Bending Cocepts, Inc. · 2000