B21C 37/18
Conical tubes
Official title: conical tubes
B21C37/18 (Conical tubes) appears on 79 US grants and 65 published applications in this corpus.
Search patents in B21C- Granted patents
- 79
- Published applications
- 65
- Assignees
- 45
- Inventors
- 138
- Latest grant
- 19 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 3 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 3 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 1 |
| 2003 | 2 | 3 |
| 2004 | 3 | 2 |
| 2005 | 0 | 3 |
| 2006 | 2 | 4 |
| 2007 | 0 | 5 |
| 2008 | 2 | 2 |
| 2009 | 2 | 0 |
| 2010 | 0 | 4 |
| 2011 | 1 | 3 |
| 2012 | 1 | 1 |
| 2013 | 2 | 2 |
| 2014 | 1 | 3 |
| 2015 | 3 | 4 |
| 2016 | 6 | 2 |
| 2017 | 0 | 2 |
| 2018 | 3 | 2 |
| 2019 | 5 | 6 |
| 2020 | 1 | 2 |
| 2021 | 3 | 6 |
| 2022 | 4 | 4 |
| 2023 | 5 | 3 |
| 2024 | 1 | 1 |
| 2025 | 4 | 0 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Spiral forming19 May 2026US 12,629,738 B2Keystone Tower Systems, Inc.
- Tubular structure reinforcing13 May 2025US 12,297,951 B2Keystone Tower Systems, Inc.
- Control system and method for tapered structure construction25 Mar 2025US 12,257,616 B2Keystone Tower Systems, Inc.
- Sheet transitioning in spiral formed structures4 Mar 2025US 12,240,025 B2Keystone Tower Systems, Inc.
- Tapered structure construction18 Feb 2025US 12,226,813 B2Keystone Tower Systems, Inc.
- Spiral forming14 Mar 2024US 2024/0082899 A1Keystone Tower Systems, Inc.
- Method and apparatus for manufacturing metal pipe31 Aug 2023US 2023/0271240 A1Nakata Manufacturing Co., Ltd.
- Tapered structure construction10 Aug 2023US 2023/0249236 A1Keystone Tower Systems, Inc.
- Sheet transitioning in spiral formed structures29 Jun 2023US 2023/0201901 A1Keystone Tower Systems, Inc.
- Control system and method for tapered structure construction22 Sep 2022US 2022/0297175 A1Keystone Tower Systems, Inc.
Most cited
By later US patents
- Hydroformed tubular member and method of hydroforming tubular members48US 6,216,509 B1R. J. Tower Corporation · 2001
- Sole configuration for golf club head33US 6,007,433 ACallaway Golf Company · 1999
- Variable OD coiled tubing strings24US 6,527,056 B2Ctes, L.C. · 2003
- Continuously variable speed, die-drawing device and process for metal, composites, and the like, and compositions therefrom18US 4,846,392 AHinshaw Experimental Laboratories Limited Partnership · 1989
- Device for manufacturing conical poles16US 4,947,671 A1990