- 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 3/00 - Pulping cellulose-containing materials
Patent holdings for IPC class D21C 3/00
Total number of patents in this class: 295
10-year publication summary
|
24
|
39
|
23
|
27
|
17
|
16
|
21
|
20
|
12
|
5
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| SixRing Inc. | 121 |
14 |
| Valmet AB | 463 |
9 |
| FPInnovations | 259 |
7 |
| GranBio Intellectual Property Holdings, LLC | 105 |
7 |
| Andritz Inc. | 344 |
6 |
| International Paper Company | 857 |
6 |
| Voith Patent GmbH | 2727 |
6 |
| Bio-sep Limited | 8 |
5 |
| Lenzing Aktiengesellschaft | 529 |
5 |
| Shell Oil Company | 2196 |
4 |
| API Intellectual Property Holdings, LLC | 80 |
4 |
| The Coca-Cola Company | 2528 |
4 |
| Eth Zurich | 1193 |
4 |
| Kemira Oyj | 1167 |
4 |
| Shell Internationale Research Maatschappij B.V. | 3792 |
3 |
| E. I. du Pont de Nemours and Company | 4345 |
3 |
| Novozymes A/S | 3314 |
3 |
| Purdue Research Foundation | 3277 |
3 |
| Compagnie Industrielle de La Matiere Vegetale - Cimv | 27 |
3 |
| EMPA Eidgenössische Materialprüfungs-und Forschungsanstalt | 176 |
3 |
| Other owners | 192 |