- All sections
- D - Textilespaper
- D21H - Pulp compositionspreparation thereof not covered by subclasses , impregnating or coating of papertreatment of finished paper not covered by class or subclass paper not otherwise provided for
- D21H 19/40 - Coatings with pigments characterised by the pigments siliceous, e.g. clays
Patent holdings for IPC class D21H 19/40
Total number of patents in this class: 311
10-year publication summary
|
20
|
28
|
32
|
35
|
25
|
23
|
37
|
28
|
43
|
7
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| WestRock MWV, LLC | 337 |
40 |
| Stora Enso Oyj | 1588 |
15 |
| Omya International AG | 766 |
14 |
| Hewlett-Packard Development Company, L.P. | 26106 |
9 |
| Billerud AB | 110 |
8 |
| Kemira Oyj | 1182 |
8 |
| Oji Holdings Corporation | 711 |
8 |
| Mitsubishi Paper Mills Limited | 233 |
6 |
| GRUPPO CORDENONS S.p.A. | 50 |
5 |
| Neenah Gessner GmbH | 69 |
5 |
| Nippon Paper Industries Co., Ltd. | 819 |
5 |
| BASF Corporation | 1710 |
4 |
| Billerudkorsnas AB | 88 |
4 |
| Imerys Minerals Limited | 119 |
4 |
| International Paper Company | 794 |
4 |
| Société des Produits Nestlé S.A. | 9129 |
3 |
| Akzo Nobel Chemicals International B.V. | 407 |
3 |
| Fiberlean Technologies Limited | 114 |
3 |
| The Penn State Research Foundation | 1489 |
3 |
| SAPPI Netherlands Services B.V. | 37 |
3 |
| Other owners | 157 |