- All sections
- D - Textiles; paper
- D21C - Production of cellulose by removing non-cellulose substances from cellulose- containing materials; regeneration of pulping liquors; apparatus therefor
- D21C 3/06 - Pulping cellulose-containing materials with acids, acid salts, or acid anhydrides bisulfites
Patent holdings for IPC class D21C 3/06
Total number of patents in this class: 124
10-year publication summary
|
11
|
9
|
10
|
7
|
7
|
2
|
24
|
20
|
5
|
3
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| SixRing Inc. | 121 |
24 |
| GranBio Intellectual Property Holdings, LLC | 105 |
16 |
| API Intellectual Property Holdings, LLC | 80 |
13 |
| Voith Patent GmbH | 2727 |
10 |
| Sekab E-Technology AB | 79 |
6 |
| Amppc Finland Oy | 5 |
5 |
| Iogen Corporation | 136 |
3 |
| Lenzing Aktiengesellschaft | 529 |
3 |
| Ip2ipo Innovations Limited | 164 |
3 |
| BASF SE | 19740 |
2 |
| Shell Internationale Research Maatschappij B.V. | 3792 |
2 |
| Shell Oil Company | 2196 |
2 |
| Chemstone, Inc. | 21 |
2 |
| Imperial Innovations Limited | 636 |
2 |
| International Paper Company | 857 |
2 |
| NORAM Engineering and Constructors Ltd. | 27 |
2 |
| HONG, Hook | 4 |
2 |
| American Process International LLC | 5 |
2 |
| Borregaard AS | 108 |
1 |
| Borregaard Industries Limited, Norge | 7 |
1 |
| Other owners | 21 |