- All sections
- D - Textilespaper
- D21C - Production of cellulose by removing non-cellulose substances from cellulose- containing materialsregeneration of pulping liquorsapparatus therefor
- D21C 1/06 - Pretreatment of the finely-divided materials before digesting with alkaline reacting compounds
Patent holdings for IPC class D21C 1/06
Total number of patents in this class: 155
10-year publication summary
|
11
|
8
|
5
|
10
|
8
|
16
|
17
|
20
|
6
|
4
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Billerud AB | 162 |
15 |
| Kimberly-clark Worldwide, Inc. | 5308 |
10 |
| Purac Biochem B.V. | 477 |
7 |
| Valmet AB | 554 |
7 |
| Qilu University of Technology | 153 |
6 |
| Andritz Oy | 294 |
5 |
| The Michigan Biotechnology Institute | 15 |
4 |
| Leaf Sciences Pty Ltd | 4 |
4 |
| Cellucomp Limited | 38 |
3 |
| Cosun Biobased Products B.V. | 5 |
3 |
| FPInnovations | 225 |
3 |
| Hubei Jinhanjiang Refined Cotton Co., Ltd. | 12 |
3 |
| Metso Paper Sweden Aktiebolag | 44 |
3 |
| Södra Skogsägarna ekonomisk förening | 80 |
3 |
| Kanbol, Inc. | 9 |
3 |
| Releaf Paper France SAS | 3 |
3 |
| Shell Internationale Research Maatschappij B.V. | 3403 |
2 |
| E. I. du Pont de Nemours and Company | 3534 |
2 |
| Shell Oil Company | 2071 |
2 |
| Bahia Specialty Cellulose SA | 5 |
2 |
| Other owners | 65 |