- All sections
- D - Textilespaper
- D21C - Production of cellulose by removing non-cellulose substances from cellulose- containing materialsregeneration of pulping liquorsapparatus therefor
- D21C 3/26 - Multi-stage processes
Patent holdings for IPC class D21C 3/26
Total number of patents in this class: 128
10-year publication summary
|
8
|
14
|
10
|
14
|
11
|
10
|
8
|
12
|
5
|
3
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Valmet AB | 503 |
11 |
| DSM IP Assets B.V. | 5595 |
9 |
| GP Cellulose GmbH | 88 |
9 |
| Versalis S.P.A. | 539 |
7 |
| GranBio Intellectual Property Holdings, LLC | 119 |
6 |
| Novozymes A/S | 3318 |
5 |
| Andritz Inc. | 333 |
5 |
| Kanbol, Inc. | 9 |
4 |
| API Intellectual Property Holdings, LLC | 77 |
3 |
| RISE Research Institutes of Sweden AB | 52 |
3 |
| RISE Innventia AB | 17 |
3 |
| Andritz Aktiebolag | 65 |
3 |
| Ferrum AG | 26 |
2 |
| Fibria Celulose S.A. | 15 |
2 |
| Kolon Industries, Inc. | 1675 |
2 |
| Packaging Corporation of America | 53 |
2 |
| The Research Foundation of State University of New York | 450 |
2 |
| Solenis Technologies Cayman, L.P. | 299 |
2 |
| The Texas a & M University System | 1691 |
2 |
| RGE Pte Ltd | 8 |
2 |
| Other owners | 44 |