- All sections
- D - Textilespaper
- D21D - Treatment of the materials before passing to the paper-making machine
- D21D 5/02 - Straining or screening the pulp
Patent holdings for IPC class D21D 5/02
Total number of patents in this class: 138
10-year publication summary
|
5
|
4
|
10
|
10
|
5
|
7
|
11
|
6
|
8
|
4
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Voith Patent GmbH | 2774 |
38 |
| Seiko Epson Corporation | 20022 |
5 |
| Andritz Oy | 288 |
5 |
| Metsa Board Oyj | 51 |
5 |
| Stora Enso Oyj | 1633 |
5 |
| Valmet AB | 537 |
5 |
| Valmet Technologies Oy | 285 |
5 |
| Kadant Black Clawson LLC | 49 |
5 |
| The Procter & Gamble Company | 21900 |
3 |
| Andritz Fiedler GmbH | 29 |
3 |
| Advanced Fiber Technologies (aft) Trust | 3 |
2 |
| Aikawa Fiber Technologies Trust | 8 |
2 |
| Andritz AG | 239 |
2 |
| M-real Oyj | 16 |
2 |
| MeadWestvaco Corporation | 279 |
2 |
| Metso Paper, Inc. | 356 |
2 |
| Uniboard Canada Inc. | 70 |
2 |
| Red Wire Oy | 5 |
2 |
| Aikawa Fiber Technologies Inc. | 19 |
2 |
| Qilu University of Technology (Shandong Academy of Sciences) | 62 |
2 |
| Other owners | 39 |