- 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 21/28 - Colorants
Patent holdings for IPC class D21H 21/28
Total number of patents in this class: 222
10-year publication summary
|
10
|
15
|
16
|
17
|
25
|
9
|
10
|
12
|
11
|
5
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| DyStar Colours Distribution GmbH | 164 |
10 |
| Kemira Oyj | 1256 |
9 |
| Nippon Paper Industries Co., Ltd. | 844 |
7 |
| The Procter & Gamble Company | 21854 |
6 |
| Commissariat à l'énergie atomique et aux energies alternatives | 11118 |
6 |
| First Quality Tissue, LLC | 162 |
6 |
| Omya International AG | 777 |
6 |
| Centre National de La Recherche Scientifique | 10993 |
5 |
| Ecolab USA Inc. | 5795 |
5 |
| Kimberly-clark Worldwide, Inc. | 5304 |
4 |
| Clariant Finance (BVI) Limited | 368 |
4 |
| Stora Enso Oyj | 1649 |
4 |
| Ahlstrom-munksjo Oyj | 158 |
4 |
| BASF SE | 21292 |
3 |
| Hewlett-Packard Development Company, L.P. | 25258 |
3 |
| Papeterie Zuber Rieder | 15 |
3 |
| GPCP IP Holdings LLC | 1531 |
3 |
| Footprint International, LLC | 88 |
3 |
| Archroma IP GmbH | 461 |
2 |
| Arjo Wiggins Fine Papers Limited | 24 |
2 |
| Other owners | 127 |