B21F 35/02
Bending or deforming ends of coil springs to special shape
B21F35/02 (Bending or deforming ends of coil springs to special shape) appears on 53 US grants and 29 published applications in this corpus.
Search patents in B21F- Granted patents
- 53
- Published applications
- 29
- Assignees
- 35
- Inventors
- 73
- Latest grant
- 27 Jun 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 3 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 3 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 1 |
| 2004 | 2 | 2 |
| 2005 | 0 | 4 |
| 2006 | 2 | 0 |
| 2007 | 1 | 0 |
| 2008 | 1 | 1 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 0 | 2 |
| 2012 | 0 | 1 |
| 2013 | 1 | 0 |
| 2014 | 3 | 1 |
| 2015 | 1 | 3 |
| 2016 | 1 | 3 |
| 2017 | 2 | 4 |
| 2018 | 1 | 1 |
| 2019 | 1 | 2 |
| 2020 | 3 | 2 |
| 2021 | 1 | 0 |
| 2022 | 2 | 1 |
| 2023 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Hollow coil spring and suspension device for vehicle27 Jun 2023US 11,685,211 B2NHK Spring Co., Ltd.
- Hollow coil spring and suspension device for vehicle22 Feb 2022US 11,254,177 B2NHK Spring Co., Ltd.
- Canted coil springs and assemblies and related methods1 Feb 2022US 11,235,374 B2Bal Seal Engineering, Inc.
- Spring manufacturing machine with selectable configuration for processing tools27 Jul 2021US 11,072,020 B2Plusprings Machinery Co., Ltd
- Device and method for forming end of coiled spring10 Nov 2020US 10,828,690 B2Mitsubishi Steel Mfg. Co., Ltd.
- Hollow coil spring and suspension device for vehicle10 Feb 2022US 2022/0041027 A1NHK Spring Co., Ltd.
- Canted coil springs and assemblies and related methods3 Sep 2020US 2020/0276633 A1Bal Seal Engineering, Inc.
- Spring manufacturing machine with selectable configuration for processing tools13 Feb 2020US 2020/0047239 A1Plusprings Machinery Co., Ltd
- Method and device for manufacturing arc-shaped coil spring7 Nov 2019US 2019/0337046 A1Tech Corporation Co., Ltd.
- Hollow coil spring and suspension device for vehicle31 Jan 2019US 2019/0030973 A1NHK Spring Co., Ltd.
Most cited
By later US patents
- Spring manufacturing apparatus23US 6,151,942 AKabushiki Kaisha Itaya Seisaku Sho · 2000
- Spring manufacturing apparatus and tool selection apparatus15US 6,142,002 AKabushiki Kaisha Itaya Seisaku Sho · 2000
- Cutting fixture for spiral binders and method of manufacture13US 3,972,109 AHans Sickinger Co. · 1976
- Variable canted coil spring cross section12US 8,590,867 B2Bal Seal Engineering, Inc. · 2013
- Canted coil springs and assemblies and related methods12US 9,518,626 B2Bal Seal Engineering, Inc. · 2016