- 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: 352
10-year publication summary
|
28
|
32
|
35
|
25
|
23
|
37
|
28
|
46
|
27
|
20
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| WestRock MWV, LLC | 328 |
41 |
| Omya International AG | 780 |
14 |
| Stora Enso Oyj | 1654 |
14 |
| Billerud AB | 163 |
13 |
| Oji Holdings Corporation | 798 |
10 |
| Hewlett-Packard Development Company, L.P. | 25172 |
9 |
| Kemira Oyj | 1261 |
8 |
| Nippon Paper Industries Co., Ltd. | 851 |
7 |
| Mitsubishi Paper Mills Limited | 225 |
6 |
| Neenah Gessner GmbH | 95 |
6 |
| Koehler Innovation & Technology GmbH | 56 |
6 |
| GRUPPO CORDENONS S.p.A. | 46 |
5 |
| Qwarzo S.p.A | 22 |
5 |
| BASF Corporation | 1682 |
4 |
| Billerudkorsnas AB | 88 |
4 |
| Imerys Minerals Limited | 115 |
4 |
| Mondi AG | 216 |
4 |
| Specialty Minerals (Michigan) Inc. | 234 |
4 |
| Sun Chemical Corporation | 808 |
4 |
| UNILIN, besloten vennootschap | 991 |
4 |
| Other owners | 180 |