B21C 37/123
Of coated strip material
Official title: {of coated strip material; Making multi-wall tubes}
B21C37/123 (Of coated strip material) appears on 43 US grants and 27 published applications in this corpus.
Search patents in B21C- Granted patents
- 43
- Published applications
- 27
- Assignees
- 30
- Inventors
- 99
- Latest grant
- 22 Jul 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 4 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 3 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 1 |
| 2009 | 0 | 1 |
| 2010 | 0 | 2 |
| 2011 | 0 | 3 |
| 2012 | 0 | 2 |
| 2013 | 0 | 1 |
| 2014 | 1 | 0 |
| 2015 | 1 | 0 |
| 2016 | 1 | 2 |
| 2017 | 1 | 0 |
| 2018 | 0 | 3 |
| 2019 | 1 | 3 |
| 2020 | 2 | 4 |
| 2021 | 2 | 1 |
| 2022 | 0 | 2 |
| 2023 | 1 | 1 |
| 2024 | 1 | 0 |
| 2025 | 2 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Helically wound tubular structures22 Jul 2025US 12,366,310 B2Techreo LLC
- Tubular structure reinforcing13 May 2025US 12,297,951 B2Keystone Tower Systems, Inc.
- Method for producing a carcass, a method of producing a flexible pipe and a flexible pipe18 Jun 2024US 12,011,750 B2National Oilwell Varco Denmark I/S
- Methods for making layered tubular structures10 Oct 2023US 11,779,981 B2
- Immobilised insert10 Aug 2021US 11,085,561 B2Baker Hughes Energy Technology UK Limited
- A method for producing a carcass, a method of producing a flexible pipe and a flexible pipe31 Aug 2023US 2023/0271241 A1National Oilwell Varco Denmark I/S
- Finned tube and method of manufacturing the same6 Oct 2022US 2022/0316824 A1SchmöLe GmbH
- Method for coating a pipe and pipe20 Jan 2022US 2022/0018028 A1
- Tubular structure reinforcing29 Jul 2021US 2021/0231237 A1Keystone Tower Systems, Inc.
- Methods for making layered tubular structures10 Sep 2020US 2020/0282440 A1
Most cited
By later US patents
- Base carrier sleeve for rotary printing machines29US 5,974,973 AHeidelberger Druckmaschinen AG · 1999
- 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
- Apparatus for fabricating multi-layer spiral tubes25US 4,640,453 AMitsubishi Jukogyo Kabushiki Kaisha · 1987
- Steel pipe with integrally formed liner and method of fabricating the same25US 6,009,912 A2000