- 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: 317
10-year publication summary
|
29
|
30
|
22
|
28
|
29
|
33
|
17
|
20
|
23
|
11
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Valmet AB | 510 |
41 |
| GranBio Intellectual Property Holdings, LLC | 121 |
16 |
| Billerud AB | 126 |
8 |
| Metso Paper Sweden Aktiebolag | 44 |
8 |
| Versalis S.P.A. | 541 |
8 |
| Qilu University of Technology | 153 |
7 |
| Andritz Inc. | 332 |
6 |
| Andritz Oy | 283 |
6 |
| API Intellectual Property Holdings, LLC | 77 |
5 |
| Beta Renewables, S.p.A. | 25 |
5 |
| Clariant Produkte (Deutschland) GmbH | 250 |
5 |
| Iogen Corporation | 149 |
5 |
| The Michigan Biotechnology Institute | 17 |
5 |
| UPM-Kymmene Corporation | 940 |
5 |
| Amppc Finland Oy | 5 |
5 |
| Kimberly-clark Worldwide, Inc. | 5495 |
4 |
| Leinich Beteiligungen GmbH | 8 |
4 |
| Circ, Inc. | 36 |
4 |
| Biofuel Technology Holding ApS | 6 |
4 |
| Cambi Technology AS | 40 |
3 |
| Other owners | 163 |