- All sections
- D - Textilespaper
- D21F - Paper-making machinesmethods of producing paper thereon
- D21F 1/32 - Washing wire-cloths or felts
Patent holdings for IPC class D21F 1/32
Total number of patents in this class: 121
10-year publication summary
|
12
|
9
|
9
|
14
|
8
|
14
|
3
|
6
|
2
|
2
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| MainTech Co., Ltd. | 65 |
17 |
| Voith Patent GmbH | 2759 |
13 |
| S.A. Giuseppe Cristini S.p.A. | 26 |
9 |
| Dubois Chemicals, Inc. | 179 |
7 |
| Valmet AB | 505 |
7 |
| Paprima Industries Inc. | 22 |
6 |
| Seiko Epson Corporation | 19352 |
4 |
| Ecolab USA Inc. | 5480 |
4 |
| First Quality Tissue, LLC | 156 |
4 |
| Kadant Inc. | 45 |
4 |
| Valmet Technologies, Inc. | 147 |
4 |
| GPCP IP Holdings LLC | 1631 |
4 |
| International Paper Company | 788 |
3 |
| Novozymes A/S | 3318 |
2 |
| Andritz AG | 232 |
2 |
| AstenJohnson, Inc. | 128 |
2 |
| Buckman Laboratories International, Inc. | 237 |
2 |
| CTP GmbH | 17 |
2 |
| Effcom Oy | 8 |
2 |
| Metso Paper, Inc. | 422 |
2 |
| Other owners | 21 |