- All sections
- D - Textilespaper
- D21C - Production of cellulose by removing non-cellulose substances from cellulose- containing materialsregeneration of pulping liquorsapparatus therefor
- D21C 3/08 - Pulping cellulose-containing materials with acids, acid salts, or acid anhydrides sulfur dioxidePulping cellulose-containing materials with acids, acid salts, or acid anhydrides sulfurous acidPulping cellulose-containing materials with acids, acid salts, or acid anhydrides bisulfites calcium bisulfite
Patent holdings for IPC class D21C 3/08
Total number of patents in this class: 1
10-year publication summary
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| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| GranBio Intellectual Property Holdings, LLC | 125 |
1 |
| Other owners | 0 |