- All sections
- D - Textilespaper
- D21C - Production of cellulose by removing non-cellulose substances from cellulose- containing materialsregeneration of pulping liquorsapparatus therefor
- D21C 3/00 - Pulping cellulose-containing materials
Patent holdings for IPC class D21C 3/00
Total number of patents in this class: 316
10-year publication summary
|
32
|
19
|
21
|
14
|
13
|
19
|
19
|
14
|
23
|
13
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| SixRing Inc. | 163 |
21 |
| Valmet AB | 511 |
10 |
| GranBio Intellectual Property Holdings, LLC | 121 |
10 |
| FPInnovations | 241 |
7 |
| Andritz Inc. | 332 |
6 |
| Bio-sep Limited | 7 |
6 |
| International Paper Company | 785 |
6 |
| Voith Patent GmbH | 2765 |
6 |
| Lenzing Aktiengesellschaft | 520 |
5 |
| Nicca Chemical Co., Ltd. | 135 |
5 |
| Shell Oil Company | 2138 |
4 |
| The Coca-Cola Company | 2495 |
4 |
| Eth Zurich | 1283 |
4 |
| University of Maryland, College Park | 1023 |
4 |
| Shell Internationale Research Maatschappij B.V. | 3546 |
3 |
| E. I. du Pont de Nemours and Company | 4026 |
3 |
| Kimberly-clark Worldwide, Inc. | 5449 |
3 |
| Novozymes A/S | 3325 |
3 |
| Purdue Research Foundation | 3646 |
3 |
| API Intellectual Property Holdings, LLC | 78 |
3 |
| Other owners | 200 |