- 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 23/28 - Addition before the dryer section, e.g. at the wet end or press section
Patent holdings for IPC class D21H 23/28
Total number of patents in this class: 57
10-year publication summary
|
3
|
4
|
6
|
4
|
3
|
6
|
5
|
5
|
1
|
1
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Stora Enso Oyj | 1658 |
15 |
| Kemira Oyj | 1217 |
6 |
| BASF SE | 21080 |
4 |
| Ecolab USA Inc. | 5567 |
4 |
| Seiko Epson Corporation | 19668 |
2 |
| Domtar Paper Company, LLC | 122 |
2 |
| Fiberlean Technologies Limited | 112 |
2 |
| Paptic Oy | 29 |
2 |
| WestRock MWV, LLC | 340 |
2 |
| Plastic Free Packaging Pty Ltd | 3 |
2 |
| Hewlett-Packard Development Company, L.P. | 25611 |
1 |
| Brown LLC | 56 |
1 |
| Daio Paper Corporation | 1391 |
1 |
| IBS Austria GmbH | 9 |
1 |
| Jonhs Manville | 2 |
1 |
| M-real Oyj | 25 |
1 |
| Nalco Company | 567 |
1 |
| Neenah Gessner GmbH | 74 |
1 |
| Onduline | 97 |
1 |
| OrganoClick AB | 71 |
1 |
| Other owners | 6 |