- 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 3/02 - Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
Patent holdings for IPC class D21C 3/02
Total number of patents in this class: 405
10-year publication summary
|
31
|
43
|
35
|
25
|
32
|
28
|
31
|
37
|
31
|
8
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| GP Cellulose GmbH | 98 |
15 |
| Andritz Oy | 276 |
11 |
| Kimberly-clark Worldwide, Inc. | 5854 |
10 |
| Valmet AB | 463 |
10 |
| E. I. du Pont de Nemours and Company | 4345 |
9 |
| Lenzing Aktiengesellschaft | 529 |
9 |
| WestRock MWV, LLC | 335 |
9 |
| Européenne de Biomasse | 42 |
9 |
| Nippon Paper Industries Co., Ltd. | 782 |
8 |
| Södra Skogsägarna ekonomisk förening | 69 |
8 |
| BASF SE | 19740 |
6 |
| Licella Pty Limited | 29 |
6 |
| University of Maryland, College Park | 894 |
6 |
| Novozymes A/S | 3314 |
5 |
| Canfor Pulp Ltd. | 17 |
5 |
| Leaf Sciences Pty Ltd | 5 |
5 |
| Andritz Inc. | 344 |
4 |
| Bahia Specialty Cellulose SA | 5 |
4 |
| Cellucomp Limited | 34 |
4 |
| Cosun Biobased Products B.V. | 7 |
4 |
| Other owners | 258 |