- All sections
- D - Textilespaper
- D21C - Production of cellulose by removing non-cellulose substances from cellulose- containing materialsregeneration of pulping liquorsapparatus therefor
- D21C 1/04 - Pretreatment of the finely-divided materials before digesting with acid reacting compounds
Patent holdings for IPC class D21C 1/04
Total number of patents in this class: 160
10-year publication summary
|
23
|
11
|
17
|
16
|
16
|
14
|
6
|
5
|
8
|
5
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Valmet AB | 515 |
31 |
| Iogen Corporation | 149 |
10 |
| Sekab E-Technology AB | 78 |
5 |
| SixRing Inc. | 164 |
5 |
| API Intellectual Property Holdings, LLC | 78 |
4 |
| UPM-Kymmene Corporation | 943 |
4 |
| Leaf Sciences Pty Ltd | 4 |
4 |
| New Energy Blue LLC | 14 |
4 |
| BASF SE | 21017 |
3 |
| Andritz AG | 235 |
3 |
| Andritz Inc. | 333 |
3 |
| Andritz Oy | 287 |
3 |
| Bio-sep Limited | 7 |
3 |
| GP Cellulose GmbH | 88 |
3 |
| IFG Technologies, LLC | 8 |
3 |
| Kimberly-clark Worldwide, Inc. | 5451 |
2 |
| Novozymes A/S | 3336 |
2 |
| Case Western Reserve University | 1841 |
2 |
| Chempolis Oy | 26 |
2 |
| Kabushiki Kaisha Toa Kogyo | 3 |
2 |
| Other owners | 62 |