- 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 21/10 - Retention agents or drainage improvers
Patent holdings for IPC class D21H 21/10
Total number of patents in this class: 446
10-year publication summary
|
50
|
29
|
44
|
35
|
27
|
22
|
9
|
23
|
16
|
6
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Kemira Oyj | 1167 |
78 |
| Solenis Technologies, L.P. | 306 |
37 |
| Ecolab USA Inc. | 5190 |
28 |
| S.p.c.m. SA | 308 |
27 |
| Stora Enso Oyj | 1504 |
21 |
| BASF SE | 19740 |
17 |
| Nalco Company | 620 |
15 |
| Hercules Incorporated | 183 |
12 |
| Solenis Technologies Cayman, L.P. | 81 |
11 |
| UPM-Kymmene Corporation | 868 |
8 |
| SNF Group | 251 |
8 |
| Buckman Laboratories International, Inc. | 244 |
7 |
| Fiberlean Technologies Limited | 116 |
7 |
| BASF AG | 1258 |
6 |
| AGC Chemicals Americas, Inc. | 39 |
5 |
| Enzymatic Deinking Technologies, LLC | 44 |
5 |
| Nouryon Chemicals International B.V. | 508 |
5 |
| Akzo Nobel N.V. | 240 |
4 |
| Eka Chemicals AB | 44 |
4 |
| FPInnovations | 259 |
4 |
| Other owners | 137 |