- 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: 470
10-year publication summary
|
35
|
25
|
32
|
28
|
31
|
37
|
37
|
33
|
39
|
22
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| GP Cellulose GmbH | 86 |
15 |
| Kimberly-clark Worldwide, Inc. | 5295 |
14 |
| Andritz Oy | 293 |
11 |
| Södra Skogsägarna ekonomisk förening | 81 |
11 |
| University of Maryland, College Park | 1084 |
10 |
| Valmet AB | 555 |
10 |
| E. I. du Pont de Nemours and Company | 3511 |
9 |
| Billerud AB | 163 |
9 |
| WestRock MWV, LLC | 328 |
9 |
| Européenne de Biomasse | 47 |
9 |
| Lenzing Aktiengesellschaft | 499 |
8 |
| Nippon Paper Industries Co., Ltd. | 851 |
7 |
| Licella Pty Limited | 29 |
6 |
| BASF SE | 21310 |
5 |
| UPM-Kymmene Corporation | 993 |
5 |
| Kanbol, Inc. | 9 |
5 |
| Novozymes A/S | 3384 |
4 |
| Alliance for Sustainable Energy, LLC | 305 |
4 |
| Andritz Inc. | 322 |
4 |
| Bahia Specialty Cellulose SA | 5 |
4 |
| Other owners | 311 |