- All sections
- D - Textiles; paper
- D21C - Production of cellulose by removing non-cellulose substances from cellulose- containing materials; regeneration of pulping liquors; apparatus 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: 165
10-year publication summary
|
33
|
16
|
18
|
19
|
18
|
14
|
7
|
5
|
7
|
1
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Valmet AB | 494 |
31 |
| Iogen Corporation | 142 |
13 |
| Sekab E-Technology AB | 78 |
5 |
| Leaf Sciences Pty Ltd | 5 |
5 |
| API Intellectual Property Holdings, LLC | 78 |
4 |
| New Energy Blue LLC | 14 |
4 |
| BASF SE | 20387 |
3 |
| Andritz AG | 227 |
3 |
| Andritz Inc. | 336 |
3 |
| Andritz Oy | 280 |
3 |
| Bio-sep Limited | 7 |
3 |
| GP Cellulose GmbH | 93 |
3 |
| UPM-Kymmene Corporation | 912 |
3 |
| SixRing Inc. | 141 |
3 |
| IFG Technologies, LLC | 7 |
3 |
| Kimberly-clark Worldwide, Inc. | 5520 |
2 |
| Novozymes A/S | 3304 |
2 |
| Case Western Reserve University | 1772 |
2 |
| Chempolis Oy | 22 |
2 |
| Iogen Energy Corporation | 93 |
2 |
| Other owners | 66 |