- 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 27/08 - Filter paper
Patent holdings for IPC class D21H 27/08
Total number of patents in this class: 132
10-year publication summary
|
4
|
5
|
8
|
11
|
10
|
8
|
9
|
16
|
12
|
1
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| delfortgroup AG | 154 |
10 |
| Mondi AG | 196 |
4 |
| Hokuetsu Corporation | 64 |
4 |
| The Procter & Gamble Company | 21972 |
3 |
| Glatfelter Gernsbach GmbH | 45 |
3 |
| GP Cellulose GmbH | 87 |
3 |
| Japan Tobacco Inc. | 3548 |
3 |
| South China University of Technology | 1853 |
3 |
| Teijin Frontier Co., Ltd. | 241 |
3 |
| Detectachem, Inc. | 18 |
3 |
| Imam Mohammad Ibn Saud Islamic University | 215 |
3 |
| SWM Holdco Luxembourg | 40 |
3 |
| Purdue Research Foundation | 3814 |
2 |
| Axagarius GmbH & Co. KG | 17 |
2 |
| Borregaard AS | 127 |
2 |
| Glatfelter Gernsbach GmbH & Co. KG | 14 |
2 |
| Hokuetsu Kishu Paper Co., Ltd. | 13 |
2 |
| Innventia AB | 33 |
2 |
| Koslow Technologies Corporation | 12 |
2 |
| Lubrizol Advanced Materials, Inc. | 949 |
2 |
| Other owners | 71 |