- All sections
- B - Performing operations; transporting
- B21F - Working or processing of metal wire
- B21F 35/00 - Making springs from wire
Patent holdings for IPC class B21F 35/00
Total number of patents in this class: 141
10-year publication summary
|
16
|
14
|
23
|
12
|
12
|
13
|
12
|
5
|
4
|
3
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| NHK Spring Co., Ltd. | 1657 |
32 |
| WAFIOS Aktiengesellschaft | 86 |
9 |
| L & P Property Management Company | 970 |
6 |
| Kabushiki Kaisha Itaya Seisaku SHO | 6 |
4 |
| Simplex Rapid S.r.l. | 4 |
4 |
| Spühl GmbH | 36 |
4 |
| BAL Seal Engineering, LLC | 106 |
4 |
| Guangzhou Lianrou Machinery & Equipment Co., Ltd. | 38 |
3 |
| Mitsubishi Steel Mfg. Co., Ltd. | 137 |
3 |
| Orii & MEC Corporation | 5 |
3 |
| Plusprings Machinery Co.,Ltd | 5 |
3 |
| HS Products Ltd. | 34 |
3 |
| Umit Elektronik Makina Sanayi ve Ticaret A.S. | 3 |
3 |
| Zhejiang Huajian Intelligent Equipment Ltd. | 11 |
3 |
| Korea Institute of Science and Technology | 2022 |
2 |
| Dae Won Kang Up Co., Ltd. | 19 |
2 |
| Nit Korea Co., Ltd | 2 |
2 |
| Radyne Corporation | 39 |
2 |
| Sealy Technology LLC | 364 |
2 |
| Daewon Applied Eng. Co. | 18 |
2 |
| Other owners | 45 |