B21D 39/20
With mandrels
Official title: with mandrels, e.g. expandable
B21D39/20 (With mandrels) appears on 342 US grants and 236 published applications in this corpus.
Search patents in B21D- Granted patents
- 342
- Published applications
- 236
- Assignees
- 205
- Inventors
- 602
- Latest grant
- 17 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 5 | 0 |
| 1978 | 3 | 0 |
| 1979 | 3 | 0 |
| 1980 | 8 | 0 |
| 1981 | 3 | 0 |
| 1982 | 6 | 0 |
| 1983 | 11 | 0 |
| 1984 | 7 | 0 |
| 1985 | 9 | 0 |
| 1986 | 6 | 0 |
| 1987 | 10 | 0 |
| 1988 | 13 | 0 |
| 1989 | 9 | 0 |
| 1990 | 6 | 0 |
| 1991 | 9 | 0 |
| 1992 | 4 | 0 |
| 1993 | 6 | 0 |
| 1994 | 2 | 0 |
| 1995 | 4 | 0 |
| 1996 | 6 | 0 |
| 1997 | 6 | 0 |
| 1998 | 7 | 0 |
| 1999 | 6 | 0 |
| 2000 | 4 | 0 |
| 2001 | 4 | 2 |
| 2002 | 6 | 2 |
| 2003 | 4 | 4 |
| 2004 | 2 | 8 |
| 2005 | 5 | 9 |
| 2006 | 6 | 3 |
| 2007 | 6 | 11 |
| 2008 | 8 | 11 |
| 2009 | 3 | 11 |
| 2010 | 5 | 8 |
| 2011 | 12 | 8 |
| 2012 | 8 | 8 |
| 2013 | 8 | 11 |
| 2014 | 2 | 10 |
| 2015 | 6 | 12 |
| 2016 | 7 | 9 |
| 2017 | 13 | 3 |
| 2018 | 2 | 18 |
| 2019 | 10 | 14 |
| 2020 | 9 | 14 |
| 2021 | 16 | 14 |
| 2022 | 15 | 12 |
| 2023 | 9 | 8 |
| 2024 | 7 | 9 |
| 2025 | 7 | 11 |
| 2026 | 2 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Pipe expanding tool17 Mar 2026US 12,576,441 B2Makita Corporation
- Joining method, and device for such13 Jan 2026US 12,521,782 B2Mahle International GmbH
- Coldwork holes with seamless sleeve and uniform expansion30 Dec 2025US 12,508,637 B1
- Internal hydroforming method for manufacturing heat pipe wicks utilizing a hollow mandrel and sheath21 Oct 2025US 12,447,521 B2Westinghouse Electric Corp.
- Expansion tool19 Aug 2025US 12,390,849 B2Milwaukee Electric Tool Corporation
- Pipe expander30 Jul 2026US 2026/0216780 A1Emerson Professional Tools (Shanghai) Co., Ltd.
- Producing a Body Element21 May 2026US 2026/0138454 A1Bayerische Motoren Werke Aktiengesellschaft
- Intermittent rotation structure for extension tool, and extension tool7 May 2026US 2026/0124665 A1Changzhou Canty Electric Industry Co., Ltd
- Compression collar expander assembly and method of use12 Mar 2026US 2026/0070114 A1Life Technologies Corporation
- Tube expander5 Mar 2026US 2026/0061477 A1Zhejiang Prulde Electric Appliance Co., Ltd.
Most cited
By later US patents
- Deformable member175US 6,896,049 B2Zeroth Technology Ltd. · 2005
- Self-centering seal for use in hydraulically expanding tubes152US 4,359,889 AHaskel Engineering & Supply Company · 1982
- Sleeving method134US 4,368,571 AWestinghouse Electric Corp. · 1983
- Internal sleeve with a plurality of lands and teeth125US 5,667,252 AFramatome Technologies, Inc. · 1997
- Expander tool124US 3,986,383 A1976