- 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 19/52 - Cellulose; Derivatives thereof
Patent holdings for IPC class D21H 19/52
Total number of patents in this class: 189
10-year publication summary
|
7
|
20
|
13
|
12
|
21
|
19
|
23
|
21
|
17
|
3
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Stora Enso Oyj | 1605 |
25 |
| Fiberlean Technologies Limited | 119 |
16 |
| Kemira Oyj | 1208 |
12 |
| Nippon Paper Industries Co., Ltd. | 809 |
7 |
| Omya International AG | 810 |
5 |
| WestRock MWV, LLC | 341 |
5 |
| BASF SE | 20403 |
4 |
| PAPACKS SALES GmbH | 33 |
4 |
| Nutrition & Biosciences USA 4, Inc. | 208 |
4 |
| Hewlett-Packard Development Company, L.P. | 27473 |
3 |
| Neenah Gessner GmbH | 63 |
3 |
| GranBio Intellectual Property Holdings, LLC | 111 |
3 |
| E. I. du Pont de Nemours and Company | 4251 |
2 |
| Seiko Epson Corporation | 18984 |
2 |
| Purdue Research Foundation | 3475 |
2 |
| Borregaard AS | 119 |
2 |
| Cellucomp Limited | 35 |
2 |
| Chemstone, Inc. | 23 |
2 |
| Daio Paper Corporation | 1390 |
2 |
| delfortgroup AG | 149 |
2 |
| Other owners | 82 |