- 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: 127
10-year publication summary
|
14
|
10
|
14
|
11
|
10
|
8
|
13
|
5
|
6
|
3
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Valmet AB | 553 |
11 |
| DSM IP Assets B.V. | 5376 |
9 |
| GP Cellulose GmbH | 86 |
9 |
| Versalis S.P.A. | 531 |
7 |
| GranBio Intellectual Property Holdings, LLC | 125 |
6 |
| Novozymes A/S | 3382 |
5 |
| Andritz Inc. | 322 |
5 |
| Kanbol, Inc. | 9 |
4 |
| API Intellectual Property Holdings, LLC | 77 |
3 |
| University of Maryland, College Park | 1085 |
3 |
| Andritz Aktiebolag | 67 |
3 |
| Ferrum AG | 26 |
2 |
| Kolon Industries, Inc. | 1835 |
2 |
| Packaging Corporation of America | 52 |
2 |
| Solenis Technologies Cayman, L.P. | 320 |
2 |
| The Texas a & M University System | 1868 |
2 |
| RGE Pte Ltd | 7 |
2 |
| RISE Research Institutes of Sweden AB | 56 |
2 |
| Infinited Fiber Company Oy | 40 |
2 |
| RISE Innventia AB | 16 |
2 |
| Other owners | 44 |