- 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 21/02 - Agents for preventing deposition on the paper mill equipment, e.g. pitch or slime control
Patent holdings for IPC class D21H 21/02
Total number of patents in this class: 161
10-year publication summary
|
14
|
11
|
19
|
15
|
6
|
9
|
2
|
6
|
2
|
3
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Kemira Oyj | 1207 |
27 |
| Kurita Water Industries Ltd. | 1190 |
17 |
| Ecolab USA Inc. | 5471 |
9 |
| Omya International AG | 773 |
8 |
| Buckman Laboratories International, Inc. | 235 |
7 |
| MainTech Co., Ltd. | 65 |
7 |
| Solenis Technologies, L.P. | 334 |
7 |
| Dubois Chemicals, Inc. | 179 |
5 |
| Archroma IP GmbH | 459 |
4 |
| Hercules Incorporated | 140 |
4 |
| Gun Ei Chemical Industry Co., Ltd. | 42 |
3 |
| Harima Chemicals, Inc. | 205 |
3 |
| Linde Aktiengesellschaft | 1516 |
3 |
| Risingstar Biotech (Guangzhou) Co., Ltd. | 10 |
3 |
| BASF SE | 20904 |
2 |
| Dow Global Technologies LLC | 10373 |
2 |
| Novozymes A/S | 3318 |
2 |
| Cytec Technology Corp. | 276 |
2 |
| Imerys Minerals Limited | 120 |
2 |
| Nippon Shokubai Co., Ltd. | 1508 |
2 |
| Other owners | 42 |