- All sections
- D - Textilespaper
- D21C - Production of cellulose by removing non-cellulose substances from cellulose- containing materialsregeneration of pulping liquorsapparatus therefor
- D21C 9/16 - Bleaching with per compounds
Patent holdings for IPC class D21C 9/16
Total number of patents in this class: 267
10-year publication summary
|
24
|
23
|
14
|
16
|
22
|
17
|
22
|
25
|
19
|
6
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| GP Cellulose GmbH | 86 |
40 |
| Kemira Oyj | 1258 |
15 |
| Kimberly-clark Worldwide, Inc. | 5301 |
14 |
| SixRing Inc. | 178 |
12 |
| GPCP IP Holdings LLC | 1530 |
11 |
| Clean Chemistry, Inc. | 40 |
10 |
| Valmet AB | 553 |
7 |
| International Paper Company | 601 |
6 |
| GCF US Holdings LLC | 140 |
6 |
| Henkel AG & Co. KGaA | 10770 |
5 |
| Novozymes A/S | 3382 |
5 |
| Ecolab USA Inc. | 5792 |
5 |
| Qilu University of Technology | 153 |
5 |
| The Procter & Gamble Company | 21861 |
4 |
| BASF SE | 21303 |
4 |
| Andritz Inc. | 322 |
4 |
| Mitsubishi Gas Chemical Company, Inc. | 3619 |
4 |
| Solvay SA | 945 |
4 |
| Purdue Research Foundation | 3913 |
3 |
| AB Enzymes GmbH | 74 |
3 |
| Other owners | 100 |