- 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 23/52 - Addition to the formed paper by contacting paper with a device carrying the material
Patent holdings for IPC class D21H 23/52
Total number of patents in this class: 30
10-year publication summary
|
3
|
1
|
4
|
1
|
4
|
2
|
1
|
4
|
0
|
0
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| WestRock MWV, LLC | 332 |
4 |
| Stora Enso Oyj | 1631 |
3 |
| Philip Morris Products S.A. | 7994 |
2 |
| Ecochem Australia Pty Ltd | 41 |
2 |
| Eldorado Brasil Celulose S.A. | 4 |
2 |
| Metso Paper, Inc. | 360 |
2 |
| Nalco Company | 550 |
2 |
| Kimberly-clark Worldwide, Inc. | 5281 |
1 |
| Rohm and Haas Company | 2937 |
1 |
| Dow Global Technologies LLC | 10770 |
1 |
| Billerud AB | 146 |
1 |
| Glatfelter Gernsbach GmbH & Co. KG | 14 |
1 |
| KTH Holding AB | 15 |
1 |
| SK Global Chemical Co., Ltd. | 80 |
1 |
| SK Innovation Co., Ltd. | 1450 |
1 |
| Voith Patent GmbH | 2778 |
1 |
| Giesecke+Devrient Currency Technology GmbH | 938 |
1 |
| Zhejiang Jinjiahao Green Nanomaterial Co., Ltd. | 1 |
1 |
| Galtfelter Gernsbach GmbH | 1 |
1 |
| Shree Krishna Paper Mills and Industries Limited | 1 |
1 |
| Other owners | 0 |