B21C 37/125
Curved section
Official title: {curved section, e.g. elbow}
B21C37/125 (Curved section) appears on 14 US grants and 10 published applications in this corpus.
Search patents in B21C- Granted patents
- 14
- Published applications
- 10
- Assignees
- 9
- Inventors
- 12
- Latest grant
- 26 Nov 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 2 |
| 2007 | 0 | 1 |
| 2008 | 1 | 0 |
| 2009 | 1 | 0 |
| 2010 | 2 | 1 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 2 | 0 |
| 2015 | 1 | 1 |
| 2016 | 0 | 1 |
| 2017 | 1 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 2 |
| 2023 | 0 | 0 |
| 2024 | 2 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Duct cutting-and-forming device for elbow duct manufacturing device26 Nov 2024US 12,151,272 B2
- Elbow-shaped duct manufacturing apparatus7 May 2024US 11,975,373 B2
- Formation and rotational apparatus and method for cylindrical workpieces16 May 2017US 9,649,768 B2Mestek, Inc.
- Formation and rotational apparatus and method for cylindrical workpieces22 Dec 2015US 9,216,447 B2Formtek, Inc.
- Manufacturing apparatus and method of spiral duct including elbow23 Dec 2014US 8,915,109 B2Jinwoong Technology Co., Ltd.
- Duct cutting-and-forming device for elbow duct manufacturing device1 Sep 2022US 2022/0274147 A1
- Elbow-Shaped Duct Manufacturing Apparatus16 Jun 2022US 2022/0184681 A1
- Formation and rotational apparatus and method for cylindrical workpieces28 Apr 2016US 2016/0114368 A1Formtek, Inc.
- Formation and rotational apparatus and method for cylindrical workpieces23 Apr 2015US 2015/0107111 A1Formtek, Inc.
- Manufacturing apparatus and method of spiral duct including elbow31 Mar 2011US 2011/0072875 A1Jinwoong Technology Co., Ltd.
Most cited
By later US patents
- Method of making a curved pipe19US 5,014,424 AFuji Kucho Kogyo Kabushiki Kaisha · 1991
- Formation and rotational apparatus for cylindrical workpieces6US 7,797,805 B2Formtek, Inc. · 2010
- Machine for forming curved conduits5US 4,287,742 A1981
- Elbow rotator5US 7,328,510 B2Met-Coil Systems Corporation · 2008
- Apparatus for making connecting pipes for connecting ducts4US 4,704,885 AAriyoshi Nakamura · 1987