- 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: 140
10-year publication summary
|
5
|
4
|
10
|
10
|
5
|
7
|
11
|
8
|
9
|
7
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Voith Patent GmbH | 2742 |
38 |
| Stora Enso Oyj | 1662 |
7 |
| Seiko Epson Corporation | 20536 |
5 |
| Andritz Fiedler GmbH | 31 |
5 |
| Andritz Oy | 294 |
5 |
| Valmet AB | 566 |
5 |
| Valmet Technologies Oy | 290 |
5 |
| Kadant Black Clawson LLC | 49 |
5 |
| Metsa Board Oyj | 53 |
4 |
| The Procter & Gamble Company | 21887 |
3 |
| Advanced Fiber Technologies (aft) Trust | 3 |
2 |
| Aikawa Fiber Technologies Trust | 7 |
2 |
| Andritz AG | 248 |
2 |
| MeadWestvaco Corporation | 268 |
2 |
| Metso Paper, Inc. | 318 |
2 |
| Red Wire Oy | 5 |
2 |
| Aikawa Fiber Technologies Inc. | 19 |
2 |
| Qilu University of Technology (Shandong Academy of Sciences) | 65 |
2 |
| Kimberly-clark Worldwide, Inc. | 5257 |
1 |
| Aikawa Iron Works Co., Ltd. | 7 |
1 |
| Other owners | 40 |