B21B 23/00
Tube-rolling not restricted to methods provided for in only one of groups
Official title: Tube-rolling not restricted to methods provided for in only one of groups B21B17/00, B21B19/00, B21B21/00, e.g. combined processes {planetary tube rolling, auxiliary arrangements, e.g. lubricating, special tube blanks, continuous casting combined with tube rolling}(B21B25/00 takes precedence)
B21B23/00 (Tube-rolling not restricted to methods provided for in only one of groups) appears on 108 US grants and 116 published applications in this corpus.
Search patents in B21B- Granted patents
- 108
- Published applications
- 116
- Assignees
- 58
- Inventors
- 264
- Latest grant
- 4 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 7 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 3 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 1 |
| 2003 | 0 | 5 |
| 2004 | 2 | 1 |
| 2005 | 1 | 1 |
| 2006 | 0 | 1 |
| 2007 | 2 | 7 |
| 2008 | 2 | 4 |
| 2009 | 1 | 10 |
| 2010 | 2 | 9 |
| 2011 | 5 | 4 |
| 2012 | 5 | 9 |
| 2013 | 7 | 15 |
| 2014 | 5 | 6 |
| 2015 | 7 | 9 |
| 2016 | 11 | 8 |
| 2017 | 4 | 10 |
| 2018 | 6 | 2 |
| 2019 | 5 | 3 |
| 2020 | 6 | 3 |
| 2021 | 2 | 1 |
| 2022 | 3 | 4 |
| 2023 | 1 | 1 |
| 2024 | 2 | 0 |
| 2025 | 3 | 0 |
| 2026 | 0 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Steel pipe for fuel injection pipe, and fuel injection pipe using same4 Nov 2025US 12,460,275 B2Nippon Steel Corporation
- Steel pipe for fuel injection pipe, and fuel injection pipe using same20 May 2025US 12,305,597 B2Nippon Steel Corporation
- Tubular structure reinforcing13 May 2025US 12,297,951 B2Keystone Tower Systems, Inc.
- 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 high-performance difficult-to-deform metal precision seamless pipe3 Dec 2024US 12,157,154 B2Taiyuan University of Science and Technology
- Bottomed tubular body processing device7 May 2026US 2026/0124656 A1Toyo Seikan Co., Ltd.
- Rolling apparatus for annular workpiece22 Jan 2026US 2026/0021522 A1
- Skew rolling apparatus, method for manufacturing seamless pipe shell, and method for manufacturing seamless steel pipe15 Jun 2023US 2023/0182185 A1Jfe Steel Corporation
- Steel pipe for fuel injection pipe, and fuel injection pipe using same5 May 2022US 2022/0136469 A1Nippon Steel Corporation
- Steel pipe for fuel injection pipe, and fuel injection pipe using same14 Apr 2022US 2022/0112572 A1Nippon Steel Corporation
Most cited
By later US patents
- Pipe element having shoulder, groove and bead and methods and apparatus for manufacture thereof31US 8,777,277 B2Victaulic Company · 2014
- Process for producing high-strength seamless steel pipe having excellent sulfide stress cracking resistance24US 5,938,865 ASumitomo Metal Industries, Ltc. · 1999
- Process for production of seamless tube and apparatus for processing seamless tube17US 4,577,481 AKocks Technik GmbH & Co. · 1986
- Methods of manufacturing steel tubes for drilling rods with improved mechanical properties, and rods made by the same15US 9,340,847 B2Tenaris Connections Limited · 2016
- Pipe element having shoulder, groove and bead13US 9,333,543 B2Victaulic Company · 2016