- All sections
- D - Textiles; paper
- D21C - Production of cellulose by removing non-cellulose substances from cellulose- containing materials; regeneration of pulping liquors; apparatus therefor
- D21C 9/10 - Bleaching
Patent holdings for IPC class D21C 9/10
Total number of patents in this class: 450
10-year publication summary
|
29
|
32
|
42
|
36
|
33
|
35
|
35
|
34
|
26
|
4
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| GP Cellulose GmbH | 98 |
31 |
| Kemira Oyj | 1167 |
25 |
| International Paper Company | 857 |
16 |
| Andritz Oy | 276 |
15 |
| GPCP IP Holdings LLC | 1733 |
14 |
| Ecolab USA Inc. | 5190 |
12 |
| Valmet AB | 463 |
12 |
| BASF SE | 19740 |
11 |
| UPM-Kymmene Corporation | 868 |
11 |
| GranBio Intellectual Property Holdings, LLC | 105 |
9 |
| Suzano S.A. | 181 |
8 |
| API Intellectual Property Holdings, LLC | 80 |
7 |
| Arkema France | 3790 |
7 |
| Siemens AG | 24990 |
6 |
| Clean Chemistry, Inc. | 33 |
6 |
| Metsa Fibre Oy | 30 |
6 |
| Novozymes A/S | 3314 |
5 |
| Buckman Laboratories International, Inc. | 244 |
5 |
| Stora Enso Oyj | 1504 |
5 |
| Catexel Technologies Limited | 9 |
5 |
| Other owners | 234 |