B21C 37/156
Making tubes with wall irregularities
Official title: {Making tubes with wall irregularities (B21C37/20, B21C37/22 take precedence)}
B21C37/156 (Making tubes with wall irregularities) appears on 98 US grants and 106 published applications in this corpus.
Search patents in B21C- Granted patents
- 98
- Published applications
- 106
- Assignees
- 83
- Inventors
- 237
- Latest grant
- 2 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 3 | 0 |
| 1996 | 1 | 0 |
| 1997 | 3 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 3 | 0 |
| 2001 | 1 | 0 |
| 2002 | 4 | 4 |
| 2003 | 1 | 1 |
| 2004 | 3 | 5 |
| 2005 | 2 | 2 |
| 2006 | 2 | 8 |
| 2007 | 1 | 5 |
| 2008 | 0 | 7 |
| 2009 | 1 | 13 |
| 2010 | 3 | 4 |
| 2011 | 1 | 4 |
| 2012 | 6 | 3 |
| 2013 | 3 | 9 |
| 2014 | 4 | 7 |
| 2015 | 7 | 1 |
| 2016 | 2 | 5 |
| 2017 | 6 | 3 |
| 2018 | 4 | 3 |
| 2019 | 2 | 4 |
| 2020 | 3 | 8 |
| 2021 | 2 | 4 |
| 2022 | 2 | 2 |
| 2023 | 4 | 2 |
| 2024 | 4 | 1 |
| 2025 | 3 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for producing pipes having topographic inner structures2 Jun 2026US 12,644,654 B2Karlsruher Institut Fuer Technologie
- Hydraulic actuator shell and preparation method7 Oct 2025US 12,434,287 B1Taiyuan University of Technology
- Helically wound tubular structures22 Jul 2025US 12,366,310 B2Techreo LLC
- Air conduit spirally wound and provided with a plurality of holes, related manufacturing machine and method and related strip3 Jun 2025US 12,318,829 B2
- Extruded material and method for producing the same10 Sep 2024US 12,083,570 B2Kobe Steel, Ltd.
- Method for a profiling system, closed profile according to the method, and housing with the closed profile25 Dec 2025US 2025/0391961 A1fischer Edelstahlrohre GmbH
- Method for producing pipes having topographic inner structures30 May 2024US 2024/0175644 A1Karlsruher Institut Fuer Technologie
- Extruded material and method for producing the same21 Dec 2023US 2023/0405658 A1Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
- Method for producing a flat tube1 Jun 2023US 2023/0166317 A1Mahle International GmbH
- Shaft assembly and method of producing the same24 Nov 2022US 2022/0371068 A1
Most cited
By later US patents
- Stents for prosthetic heart valves and methods of making same45US 8,500,801 B2Medtronic, Inc. · 2013
- Heat exchange tubes43US 5,441,106 ALlanelli Radiators Limited · 1995
- Double-walled structure in a ventilation duct system29US 6,062,270 ALindab AB · 2000
- Double wall helical pipe and strip configuration for forming same27US 4,129,152 APacific Roller Die Co., Inc. · 1978
- Method of making a brazeable metal pipe having tube-insertion apertures formed with guide lugs21US 5,243,842 AShowa Aluminum Corporation · 1993