- 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 23/04 - Addition to the pulp; After-treatment of added substances in the pulp
Patent holdings for IPC class D21H 23/04
Total number of patents in this class: 231
10-year publication summary
|
18
|
18
|
12
|
15
|
22
|
16
|
23
|
11
|
16
|
8
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Kemira Oyj | 1167 |
40 |
| Solenis Technologies, L.P. | 306 |
17 |
| Stora Enso Oyj | 1504 |
14 |
| Ecolab USA Inc. | 5190 |
11 |
| Wetend Technologies Oy | 28 |
7 |
| Daio Paper Corporation | 1407 |
5 |
| S.p.c.m. SA | 308 |
5 |
| UPM-Kymmene Corporation | 868 |
5 |
| GPCP IP Holdings LLC | 1733 |
5 |
| Suzano S.A. | 181 |
5 |
| Archroma IP GmbH | 460 |
4 |
| Mayr-Melnhof Karton Aktiengesellschaft | 209 |
4 |
| BASF SE | 19740 |
3 |
| Kimberly-clark Worldwide, Inc. | 5854 |
3 |
| Seiko Epson Corporation | 18724 |
3 |
| Akzo Nobel N.V. | 240 |
3 |
| Buckman Laboratories International, Inc. | 244 |
3 |
| Eka Chemicals AB | 44 |
3 |
| Nippon Paper Industries Co., Ltd. | 782 |
3 |
| Dow Global Technologies Inc. | 1055 |
2 |
| Other owners | 86 |