- All sections
- D - Textiles; paper
- D21H - Pulp compositions; preparation thereof not covered by subclasses , ; impregnating or coating of paper; treatment of finished paper not covered by class or subclass ; paper not otherwise provided for
- D21H 21/30 - Luminescent or fluorescent substances, e.g. for optical bleaching
Patent holdings for IPC class D21H 21/30
Total number of patents in this class: 192
10-year publication summary
|
17
|
12
|
23
|
11
|
5
|
3
|
6
|
5
|
1
|
0
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Archroma IP GmbH | 460 |
20 |
| Blankophor GmbH & Co. KG | 22 |
15 |
| Clariant Finance (BVI) Limited | 427 |
13 |
| Giesecke+Devrient Currency Technology GmbH | 817 |
12 |
| Nalco Company | 620 |
10 |
| Milliken & Company | 1253 |
9 |
| Global Holdings II, Inc. | 159 |
9 |
| Clariant International Ltd. | 978 |
7 |
| International Paper Company | 857 |
7 |
| Ciba Specialty Chemicals Holding Inc. | 211 |
5 |
| Hewlett-Packard Development Company, L.P. | 28538 |
4 |
| Ecolab USA Inc. | 5190 |
4 |
| 3V Sigma S.p.A. | 30 |
3 |
| Bundesdruckerei GmbH | 1024 |
3 |
| Omya International AG | 816 |
3 |
| Tianjin University of Science and Technology | 66 |
3 |
| Merck Patent GmbH | 5909 |
2 |
| Seiko Epson Corporation | 18724 |
2 |
| Abo Akademi University | 18 |
2 |
| Akzo Nobel N.V. | 240 |
2 |
| Other owners | 57 |