- All sections
- D - Textilespaper
- D21C - Production of cellulose by removing non-cellulose substances from cellulose- containing materialsregeneration of pulping liquorsapparatus 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: 431
10-year publication summary
|
43
|
35
|
25
|
32
|
28
|
31
|
37
|
36
|
29
|
17
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| GP Cellulose GmbH | 90 |
15 |
| Kimberly-clark Worldwide, Inc. | 5509 |
13 |
| Andritz Oy | 282 |
11 |
| Valmet AB | 500 |
11 |
| WestRock MWV, LLC | 338 |
10 |
| E. I. du Pont de Nemours and Company | 4116 |
9 |
| Européenne de Biomasse | 46 |
9 |
| Lenzing Aktiengesellschaft | 522 |
8 |
| Södra Skogsägarna ekonomisk förening | 74 |
8 |
| University of Maryland, College Park | 1007 |
8 |
| Nippon Paper Industries Co., Ltd. | 826 |
7 |
| BASF SE | 20803 |
6 |
| Licella Pty Limited | 28 |
6 |
| Canfor Pulp Ltd. | 16 |
5 |
| Kanbol, Inc. | 9 |
5 |
| Novozymes A/S | 3311 |
4 |
| Andritz Inc. | 333 |
4 |
| Bahia Specialty Cellulose SA | 5 |
4 |
| Cellucomp Limited | 35 |
4 |
| Cosun Biobased Products B.V. | 5 |
4 |
| Other owners | 280 |