- 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
|
19
|
22
|
18
|
14
|
14
|
20
|
17
|
21
|
21
|
13
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| GP Cellulose GmbH | 87 |
40 |
| Kemira Oyj | 1222 |
15 |
| International Paper Company | 766 |
14 |
| Kimberly-clark Worldwide, Inc. | 5409 |
12 |
| GPCP IP Holdings LLC | 1620 |
11 |
| SixRing Inc. | 166 |
11 |
| Clean Chemistry, Inc. | 40 |
10 |
| Henkel AG & Co. KGaA | 10654 |
5 |
| Novozymes A/S | 3336 |
5 |
| Ecolab USA Inc. | 5598 |
5 |
| Mitsubishi Gas Chemical Company, Inc. | 3499 |
5 |
| Valmet AB | 523 |
5 |
| Qilu University of Technology | 153 |
5 |
| The Procter & Gamble Company | 21989 |
4 |
| Arkema France | 4173 |
4 |
| Buckman Laboratories International, Inc. | 242 |
4 |
| Solvay SA | 972 |
4 |
| BASF SE | 21087 |
3 |
| Purdue Research Foundation | 3726 |
3 |
| AB Enzymes GmbH | 77 |
3 |
| Other owners | 99 |