- All sections
- D - Textilespaper
- D21H - Pulp compositionspreparation thereof not covered by subclasses , impregnating or coating of papertreatment of finished paper not covered by class or subclass paper not otherwise provided for
- D21H 21/38 - Corrosion-inhibiting agents or anti-oxidants
Patent holdings for IPC class D21H 21/38
Total number of patents in this class: 25
10-year publication summary
|
1
|
2
|
1
|
1
|
3
|
2
|
1
|
1
|
2
|
0
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Nippon Beet Sugar Manufacturing Co., Ltd. | 54 |
4 |
| Nalco Company | 540 |
3 |
| Nanospecialties, LLC | 4 |
3 |
| Hewlett-Packard Development Company, L.P. | 25268 |
2 |
| Daiwa Fine Chemicals Co., Ltd. (laboratory) | 5 |
2 |
| Ecolab USA Inc. | 5795 |
2 |
| Billerudkorsnas AB | 88 |
1 |
| Omya International AG | 777 |
1 |
| Siegwerk Druckfarben AG & Co. KGaA | 34 |
1 |
| Universiti Putra Malaysia | 148 |
1 |
| University of Florida Foundation, Inc. | 2 |
1 |
| Shaanxi University of Science & Technology | 60 |
1 |
| IIW Entourage Delivery Systems Limited | 5 |
1 |
| Sappi Papier Holding GmbH | 7 |
1 |
| Guangdong Yulan Group Co., Ltd | 2 |
1 |
| Other owners | 0 |