- 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 1/02 - Pretreatment of the finely-divided materials before digesting with water or steam
Patent holdings for IPC class D21C 1/02
Total number of patents in this class: 296
10-year publication summary
|
20
|
29
|
30
|
22
|
28
|
28
|
33
|
17
|
19
|
4
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Valmet AB | 463 |
39 |
| GranBio Intellectual Property Holdings, LLC | 105 |
13 |
| Metso Paper Sweden Aktiebolag | 48 |
8 |
| Versalis S.P.A. | 511 |
8 |
| Qilu University of Technology | 154 |
7 |
| Andritz Inc. | 344 |
6 |
| Andritz Oy | 276 |
6 |
| API Intellectual Property Holdings, LLC | 80 |
6 |
| Metso Paper, Inc. | 528 |
6 |
| Beta Renewables, S.p.A. | 25 |
5 |
| Clariant Produkte (Deutschland) GmbH | 354 |
5 |
| Iogen Corporation | 136 |
5 |
| The Michigan Biotechnology Institute | 19 |
5 |
| Amppc Finland Oy | 5 |
5 |
| Cambi Technology AS | 38 |
4 |
| UPM-Kymmene Corporation | 868 |
4 |
| Leinich Beteiligungen GmbH | 8 |
4 |
| Ch-bioforce Oy | 22 |
3 |
| Eth Zurich | 1193 |
3 |
| Evrnu, SPC | 16 |
3 |
| Other owners | 151 |