B21F 3/06
Internally on a hollow form
Official title: internally on a hollow form
B21F3/06 (Internally on a hollow form) appears on 12 US grants and 20 published applications in this corpus.
Search patents in B21F- Granted patents
- 12
- Published applications
- 20
- Assignees
- 12
- Inventors
- 41
- Latest grant
- 23 Apr 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 1 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 2 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
| 2014 | 0 | 1 |
| 2015 | 1 | 2 |
| 2016 | 1 | 2 |
| 2017 | 2 | 2 |
| 2018 | 1 | 1 |
| 2019 | 2 | 3 |
| 2020 | 2 | 1 |
| 2021 | 0 | 2 |
| 2022 | 0 | 0 |
| 2023 | 0 | 1 |
| 2024 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Coiling machine, method for manufacturing coil spring, and coil spring23 Apr 2024US 11,964,321 B2NHK Spring Co., Ltd.
- Servo-rotating all-function tool module for use with spring forming machine14 Apr 2020US 10,618,098 B2
- Coiling machine and manufacturing method of coil spring11 Feb 2020US 10,556,265 B2NHK Spring Co., Ltd.
- Controlling device for coil spring bending tool and controlling method therof16 Jul 2019US 10,350,669 B2
- Wire forming machine14 May 2019US 10,286,435 B2Asahi-Seiki Manufacturing Co., Ltd.
- Wire treatment method and apparatus23 Nov 2023US 2023/0372989 A1Hs Products Ltd
- Coiling machine, method for manufacturing coil spring, and coil spring21 Oct 2021US 2021/0323047 A1NHK Spring Co., Ltd.
- Apparatus and method for forming springs24 Jun 2021US 2021/0187588 A1
- Helical compression spring and method for producing same30 Jul 2020US 2020/0240487 A1NHK Spring Co., Ltd.
- Method and device for manufacturing arc-shaped coil spring7 Nov 2019US 2019/0337046 A1Tech Corporation Co., Ltd.
Most cited
By later US patents
- Curved helical compression spring27US 6,375,174 B2Chuo Hatsujo Kabushiki Kaisha · 2002
- Spring-making machine6US 5,791,184 A1998
- Wire forming machine1US 10,286,435 B2Asahi-Seiki Manufacturing Co., Ltd. · 2019
- Coiling machine and manufacturing method of coil spring1US 10,556,265 B2NHK Spring Co., Ltd. · 2020
- Servo-rotating all-function tool module for use with spring forming machine1US 10,618,098 B22020