- All sections
- D - Textilespaper
- D21C - Production of cellulose by removing non-cellulose substances from cellulose- containing materialsregeneration of pulping liquorsapparatus 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: 328
10-year publication summary
|
30
|
22
|
28
|
29
|
33
|
17
|
20
|
32
|
14
|
10
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Valmet AB | 554 |
40 |
| Billerud AB | 162 |
19 |
| GranBio Intellectual Property Holdings, LLC | 125 |
17 |
| Metso Paper Sweden Aktiebolag | 44 |
8 |
| Versalis S.P.A. | 531 |
8 |
| Andritz Oy | 294 |
7 |
| Qilu University of Technology | 153 |
7 |
| Andritz Inc. | 322 |
6 |
| API Intellectual Property Holdings, LLC | 77 |
5 |
| Beta Renewables, S.p.A. | 25 |
5 |
| Iogen Corporation | 159 |
5 |
| UPM-Kymmene Corporation | 994 |
5 |
| Amppc Finland Oy | 5 |
5 |
| Kimberly-clark Worldwide, Inc. | 5308 |
4 |
| The Michigan Biotechnology Institute | 15 |
4 |
| Leinich Beteiligungen GmbH | 8 |
4 |
| Circ, Inc. | 37 |
4 |
| Biofuel Technology Holding ApS | 7 |
4 |
| Cambi Technology AS | 41 |
3 |
| Ch-bioforce Oy | 25 |
3 |
| Other owners | 165 |