- All sections
- D - Textilespaper
- D21C - Production of cellulose by removing non-cellulose substances from cellulose- containing materialsregeneration of pulping liquorsapparatus therefor
- D21C 3/00 - Pulping cellulose-containing materials
Patent holdings for IPC class D21C 3/00
Total number of patents in this class: 318
10-year publication summary
|
23
|
27
|
17
|
16
|
22
|
21
|
16
|
25
|
20
|
7
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| SixRing Inc. | 178 |
20 |
| Valmet AB | 554 |
10 |
| GranBio Intellectual Property Holdings, LLC | 125 |
10 |
| FPInnovations | 225 |
7 |
| Nicca Chemical Co., Ltd. | 145 |
7 |
| Andritz Inc. | 322 |
6 |
| Bio-sep Limited | 8 |
6 |
| University of Maryland, College Park | 1085 |
6 |
| Kimberly-clark Worldwide, Inc. | 5305 |
5 |
| Lenzing Aktiengesellschaft | 502 |
5 |
| Shell Oil Company | 2067 |
4 |
| Novozymes A/S | 3381 |
4 |
| The Coca-Cola Company | 2443 |
4 |
| Eth Zurich | 1323 |
4 |
| International Paper Company | 600 |
4 |
| Solenis Technologies, L.P. | 305 |
4 |
| Pierson Capital Environmental (Beijing) Limited | 11 |
4 |
| Shell Internationale Research Maatschappij B.V. | 3398 |
3 |
| E. I. du Pont de Nemours and Company | 3526 |
3 |
| Purdue Research Foundation | 3921 |
3 |
| Other owners | 199 |