- All sections
- D - Textilespaper
- D21F - Paper-making machinesmethods of producing paper thereon
- D21F 3/04 - Arrangements thereof
Patent holdings for IPC class D21F 3/04
Total number of patents in this class: 145
10-year publication summary
|
7
|
11
|
8
|
6
|
16
|
13
|
10
|
7
|
7
|
5
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Voith Patent GmbH | 2767 |
59 |
| Andritz AG | 234 |
17 |
| Valmet AB | 514 |
11 |
| The Procter & Gamble Company | 21998 |
10 |
| Metso Paper, Inc. | 420 |
9 |
| Seiko Epson Corporation | 19556 |
7 |
| Stowe Woodward Licensco, LLC | 53 |
4 |
| International Paper Company | 785 |
3 |
| Duplo Seiko Corporation | 89 |
2 |
| Ichikawa Co., Ltd. | 101 |
2 |
| Stora Enso Oyj | 1656 |
2 |
| Valmet Technologies Oy | 286 |
2 |
| UPM Specialty Papers Oy | 5 |
2 |
| Albany International Corp. | 256 |
1 |
| Allimand | 3 |
1 |
| Andritz Kusters GmbH | 52 |
1 |
| Billerudkorsnas AB | 88 |
1 |
| Chan Li Machinery Co., Ltd. | 33 |
1 |
| Eastman Chemical Company | 2207 |
1 |
| Metso Paper Karlstad AB | 9 |
1 |
| Other owners | 8 |