- All sections
- D - Textilespaper
- D21C - Production of cellulose by removing non-cellulose substances from cellulose- containing materialsregeneration of pulping liquorsapparatus therefor
- D21C 3/22 - Other features of pulping processes
Patent holdings for IPC class D21C 3/22
Total number of patents in this class: 283
10-year publication summary
|
13
|
20
|
20
|
12
|
13
|
19
|
20
|
26
|
24
|
9
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Shell Internationale Research Maatschappij B.V. | 3390 |
9 |
| Shell Oil Company | 2064 |
9 |
| Ecolab USA Inc. | 5831 |
8 |
| Kemira Oyj | 1262 |
8 |
| Valmet AB | 561 |
8 |
| SixRing Inc. | 176 |
8 |
| Kimberly-clark Worldwide, Inc. | 5257 |
7 |
| GranBio Intellectual Property Holdings, LLC | 125 |
7 |
| BASF SE | 21320 |
6 |
| Buckman Laboratories International, Inc. | 239 |
6 |
| Pierson Capital Environmental (Beijing) Limited | 11 |
6 |
| Renmatix, Inc. | 132 |
5 |
| Circ, Inc. | 38 |
5 |
| Andritz Inc. | 324 |
4 |
| Eth Zurich | 1330 |
4 |
| Nalco Company | 530 |
4 |
| Solenis Technologies Cayman, L.P. | 321 |
4 |
| Solenis Technologies, L.P. | 304 |
4 |
| Suzano S.A. | 193 |
4 |
| IFG Technologies, LLC | 13 |
4 |
| Other owners | 163 |