- 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 21/52 - Additives of definite length or shape
Patent holdings for IPC class D21H 21/52
Total number of patents in this class: 234
10-year publication summary
17
|
14
|
24
|
19
|
24
|
20
|
18
|
21
|
9
|
1
|
2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
Owner |
All patents
|
This class
|
---|---|---|
Stora Enso Oyj | 1504 |
22 |
Omya International AG | 816 |
20 |
delfortgroup AG | 147 |
7 |
Domtar Paper Company, LLC | 119 |
7 |
The Procter & Gamble Company | 22178 |
6 |
Hewlett-Packard Development Company, L.P. | 28538 |
6 |
Kemira Oyj | 1167 |
6 |
WestRock MWV, LLC | 335 |
6 |
Mitsubishi Paper Mills Limited | 246 |
5 |
Mercer International Inc. | 30 |
5 |
Fiberlean Technologies Limited | 116 |
4 |
Seiko Epson Corporation | 18724 |
3 |
ALPHA Calcit Fullstoff Gesellschaft mbH | 15 |
3 |
Arjowiggins Security | 143 |
3 |
Ecolab USA Inc. | 5190 |
3 |
Imerys USA, Inc. | 135 |
3 |
International Paper Company | 857 |
3 |
J. Rettenmaier & Sohne GmbH & Co KG | 79 |
3 |
MeadWestvaco Corporation | 370 |
3 |
SAPPI Netherlands Services B.V. | 45 |
3 |
Other owners | 113 |