- All sections
- D - Textiles; paper
- D21H - Pulp compositions; preparation thereof not covered by subclasses , ; impregnating or coating of paper; treatment 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: 231
10-year publication summary
21
|
15
|
10
|
15
|
16
|
17
|
25
|
9
|
9
|
6
|
2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
Owner |
All patents
|
This class
|
---|---|---|
Kemira Oyj | 1167 |
13 |
DyStar Colours Distribution GmbH | 172 |
10 |
Nippon Paper Industries Co., Ltd. | 782 |
7 |
The Procter & Gamble Company | 22178 |
6 |
Commissariat à l'énergie atomique et aux energies alternatives | 10525 |
6 |
Clariant Finance (BVI) Limited | 427 |
6 |
Omya International AG | 816 |
6 |
Ciba Specialty Chemicals Holding Inc. | 211 |
5 |
Ecolab USA Inc. | 5190 |
5 |
Ahlstrom-munksjo Oyj | 242 |
5 |
BASF SE | 19740 |
4 |
Centre National de La Recherche Scientifique | 9632 |
4 |
Archroma IP GmbH | 460 |
4 |
First Quality Tissue, LLC | 143 |
4 |
Kimberly-clark Worldwide, Inc. | 5854 |
3 |
Hewlett-Packard Development Company, L.P. | 28538 |
3 |
Ciba Holding Inc. | 177 |
3 |
Clariant International Ltd. | 978 |
3 |
Papeterie Zuber Rieder | 15 |
3 |
Stora Enso Oyj | 1504 |
3 |
Other owners | 128 |