- All sections
- D - Textiles; paper
- 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: 142
10-year publication summary
|
5
|
11
|
5
|
4
|
10
|
10
|
5
|
7
|
10
|
3
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Voith Patent GmbH | 2727 |
37 |
| Metso Paper, Inc. | 528 |
8 |
| Andritz Oy | 276 |
6 |
| Seiko Epson Corporation | 18724 |
5 |
| Valmet AB | 463 |
5 |
| Metsa Board Oyj | 49 |
4 |
| Stora Enso Oyj | 1504 |
4 |
| Valmet Technologies Oy | 284 |
4 |
| M-real Oyj | 46 |
3 |
| MeadWestvaco Corporation | 370 |
3 |
| The Procter & Gamble Company | 22178 |
2 |
| Advanced Fiber Technologies (aft) Trust | 3 |
2 |
| Aikawa Fiber Technologies Trust | 11 |
2 |
| Andritz AG | 218 |
2 |
| Andritz Fiedler GmbH | 26 |
2 |
| ICM, Inc. | 69 |
2 |
| Kemira Oyj | 1167 |
2 |
| Lee Tech LLC | 32 |
2 |
| TamPulping Oy | 5 |
2 |
| Uniboard Canada Inc. | 73 |
2 |
| Other owners | 43 |