B21B 25/00
Mandrels for metal tube rolling mills
Official title: Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor {; Construction of, or alloys for, mandrels or plugs}
B21B25/00 (Mandrels for metal tube rolling mills) appears on 161 US grants and 107 published applications in this corpus.
Search patents in B21B- Granted patents
- 161
- Published applications
- 107
- Assignees
- 65
- Inventors
- 323
- Latest grant
- 15 Apr 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 8 | 0 |
| 1978 | 3 | 0 |
| 1979 | 3 | 0 |
| 1980 | 4 | 0 |
| 1981 | 3 | 0 |
| 1982 | 4 | 0 |
| 1983 | 4 | 0 |
| 1984 | 3 | 0 |
| 1985 | 2 | 0 |
| 1986 | 3 | 0 |
| 1987 | 4 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 4 | 0 |
| 1991 | 3 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 3 | 0 |
| 1997 | 1 | 0 |
| 1998 | 4 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 0 |
| 2002 | 1 | 2 |
| 2003 | 1 | 2 |
| 2004 | 2 | 1 |
| 2005 | 1 | 1 |
| 2006 | 1 | 2 |
| 2007 | 3 | 4 |
| 2008 | 2 | 4 |
| 2009 | 3 | 10 |
| 2010 | 4 | 7 |
| 2011 | 7 | 6 |
| 2012 | 4 | 5 |
| 2013 | 4 | 11 |
| 2014 | 4 | 2 |
| 2015 | 2 | 22 |
| 2016 | 9 | 5 |
| 2017 | 10 | 4 |
| 2018 | 8 | 5 |
| 2019 | 7 | 2 |
| 2020 | 1 | 3 |
| 2021 | 4 | 2 |
| 2022 | 3 | 2 |
| 2023 | 2 | 2 |
| 2024 | 1 | 1 |
| 2025 | 1 | 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 handling mandrel rods in a tube rolling mill15 Apr 2025US 12,275,047 B2SMS group GmbH
- Skew rolling apparatus, method for manufacturing seamless pipe shell, and method for manufacturing seamless steel pipe24 Dec 2024US 12,172,202 B2Jfe Steel Corporation
- Method for preparing multilayer metal composite pipe26 Dec 2023US 11,850,645 B2Taiyuan University of Science and Technology
- Guide device for guiding a driving bar of a mandrel or for guiding a mandrel in a rolling process of tubular bodies31 Oct 2023US 11,801,541 B2Danieli & C. Officine Meccaniche SpA
- Piercing machine, and method for producing seamless metal pipe using the same29 Nov 2022US 11,511,326 B2Nippon Steel Corporation
- Adaptive positioning apparatus and method for thin-walled nozzles9 Jul 2026US 2026/0192346 A1Xi'an Space Engine Company Limited
- System for holding back a mandrel rod in a pipe rolling mill, and method for operating said system24 Jul 2025US 2025/0235913 A1SMS group GmbH
- High-temperature forming tool11 Jan 2024US 2024/0009722 A1Plansee SE
- Device and method for handling mandrel rods in a tube rolling mill29 Jun 2023US 2023/0201900 A1SMS group GmbH
- Skew rolling apparatus, method for manufacturing seamless pipe shell, and method for manufacturing seamless steel pipe15 Jun 2023US 2023/0182185 A1Jfe Steel Corporation
Most cited
By later US patents
- Separating-and-lubricating agent in solid form39US 4,575,430 ALonza Ltd. · 1986
- Durable method for producing finned tubing25US 5,016,460 AInco Alloys International, Inc. · 1991
- Device for controlling the speed of a mandrel in continuous retained-mandrel rolling mills19US 4,186,585 AInnocenti Santeustacchio S.p.A. · 1980
- Methods and apparatus for manufacturing seamless tube14US 4,928,507 AKocks Technik GmbH & Co. · 1990
- Method for manufacturing seamless pipe13US 5,778,714 ANKK Corporation · 1998