- All sections
- D - Textilespaper
- D21C - Production of cellulose by removing non-cellulose substances from cellulose- containing materialsregeneration of pulping liquorsapparatus therefor
- D21C 9/12 - Bleaching with halogens or halogen-containing compounds
Patent holdings for IPC class D21C 9/12
Total number of patents in this class: 47
10-year publication summary
|
5
|
4
|
3
|
2
|
4
|
2
|
1
|
3
|
2
|
1
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| GP Cellulose GmbH | 88 |
5 |
| UPM-Kymmene Corporation | 936 |
4 |
| Andritz Oy | 284 |
3 |
| Kemira Oyj | 1207 |
3 |
| Metsa Fibre Oy | 38 |
3 |
| Stora Enso Oyj | 1647 |
3 |
| Hubei Jinhanjiang Refined Cotton Co., Ltd. | 9 |
2 |
| Nano-green Biorefineries Inc. | 11 |
2 |
| Suzano S.A. | 203 |
2 |
| Centre National de La Recherche Scientifique | 10464 |
1 |
| Novozymes A/S | 3321 |
1 |
| Allison H. Sampson | 1 |
1 |
| Clean Chemistry, Inc. | 37 |
1 |
| Danisco US Inc. | 1106 |
1 |
| Hebei Jigao Chemical Fiber Co., Ltd. | 1 |
1 |
| Institut Polytechnique de Grenoble | 396 |
1 |
| International Paper Company | 788 |
1 |
| Metsa Board Oyj | 53 |
1 |
| Richard L. Sampson | 1 |
1 |
| Universite Grenoble Alpes | 730 |
1 |
| Other owners | 9 |