- All sections
- D - Textilespaper
- D21D - Treatment of the materials before passing to the paper-making machine
- D21D 5/28 - Tanks for storing or agitating pulp
Patent holdings for IPC class D21D 5/28
Total number of patents in this class: 35
10-year publication summary
|
1
|
1
|
2
|
4
|
5
|
1
|
4
|
2
|
3
|
2
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Kemira Oyj | 1207 |
12 |
| Andritz Oy | 283 |
8 |
| Valmet AB | 510 |
4 |
| Metso Paper, Inc. | 422 |
2 |
| Voith Patent GmbH | 2759 |
2 |
| Aikawa Iron Works Co., Ltd. | 7 |
1 |
| Andritz Inc. | 332 |
1 |
| Borregaard AS | 125 |
1 |
| Kurita Water Industries Ltd. | 1194 |
1 |
| Sulzer Pumpen AG | 17 |
1 |
| Nantong Xianglong Paper Industries Co.,Ltd. | 3 |
1 |
| Yulan Green Technology Co., Ltd. | 12 |
1 |
| Other owners | 0 |