- 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 23/72 - Plural serial stages only
Patent holdings for IPC class D21H 23/72
Total number of patents in this class: 39
10-year publication summary
|
4
|
2
|
2
|
2
|
3
|
2
|
3
|
9
|
3
|
1
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| WestRock MWV, LLC | 330 |
7 |
| Voith Patent GmbH | 2747 |
3 |
| Seiko Epson Corporation | 20259 |
2 |
| Stora Enso Oyj | 1650 |
2 |
| Sun Chemical Corporation | 812 |
2 |
| Trespa International B.V. | 79 |
2 |
| BASF SE | 21308 |
1 |
| Toray Industries, Inc. | 7111 |
1 |
| Alpla Werke Alwin Lehner GmbH & Co. KG | 429 |
1 |
| Arclin USA, LLC. | 93 |
1 |
| Arjo Wiggins Fine Papers Limited | 24 |
1 |
| Billerud AB | 162 |
1 |
| Brown LLC | 81 |
1 |
| Daio Paper Corporation | 1409 |
1 |
| Ecolab USA Inc. | 5803 |
1 |
| Fedrigoni S.p.A. | 264 |
1 |
| Kemira Oyj | 1257 |
1 |
| Mississippi State University | 171 |
1 |
| Nippon Beet Sugar Manufacturing Co., Ltd. | 54 |
1 |
| PA Knowledge Limited | 55 |
1 |
| Other owners | 7 |