- All sections
- D - Textilespaper
- D21C - Production of cellulose by removing non-cellulose substances from cellulose- containing materialsregeneration of pulping liquorsapparatus therefor
- D21C 5/02 - Working-up waste paper
Patent holdings for IPC class D21C 5/02
Total number of patents in this class: 436
10-year publication summary
|
37
|
32
|
27
|
39
|
39
|
30
|
29
|
31
|
29
|
19
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Unicharm Corporation | 2860 |
31 |
| Seiko Epson Corporation | 19321 |
25 |
| Kemira Oyj | 1206 |
24 |
| Uni-Charm Corporation | 600 |
23 |
| Duplo Seiko Corporation | 87 |
11 |
| UPM-Kymmene Corporation | 938 |
11 |
| GPCP IP Holdings LLC | 1634 |
10 |
| Ecolab USA Inc. | 5475 |
9 |
| Juno LLC | 19 |
9 |
| Enzymatic Deinking Technologies, LLC | 43 |
8 |
| Nalco Company | 563 |
7 |
| Andritz Inc. | 333 |
6 |
| Kemira Water Solutions, Inc. | 19 |
6 |
| Nippon Paper Industries Co., Ltd. | 830 |
6 |
| Stora Enso Oyj | 1637 |
6 |
| Mayr-Melnhof Karton Aktiengesellschaft | 226 |
5 |
| First Quality Tissue, LLC | 156 |
4 |
| King Abdulaziz University | 510 |
4 |
| Solenis Technologies, L.P. | 334 |
4 |
| Suzano S.A. | 200 |
4 |
| Other owners | 223 |