- All sections
- D - Textilespaper
- D21C - Production of cellulose by removing non-cellulose substances from cellulose- containing materialsregeneration of pulping liquorsapparatus therefor
- D21C 3/16 - Pulping cellulose-containing materials with acids, acid salts, or acid anhydrides nitrogen oxidesPulping cellulose-containing materials with acids, acid salts, or acid anhydrides nitric acid
Patent holdings for IPC class D21C 3/16
Total number of patents in this class: 4
10-year publication summary
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0
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0
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2
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0
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1
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1
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0
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0
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0
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0
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| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Kabushiki Kaisha Toa Kogyo | 3 |
1 |
| Stora Enso Oyj | 1635 |
1 |
| Veritas Tekstil Konfeksiyon Pazarlama Sanayi ve Ticaret A.S. | 60 |
1 |
| SixRing Inc. | 179 |
1 |
| Other owners | 0 |