- All sections
- D - Textilespaper
- D21F - Paper-making machinesmethods of producing paper thereon
- D21F 1/52 - Suction boxes without rolls
Patent holdings for IPC class D21F 1/52
Total number of patents in this class: 52
10-year publication summary
|
4
|
6
|
10
|
3
|
3
|
1
|
0
|
1
|
1
|
4
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Voith Patent GmbH | 2740 |
13 |
| Metso Paper, Inc. | 329 |
7 |
| AstenJohnson, Inc. | 121 |
5 |
| Seiko Epson Corporation | 20446 |
4 |
| Kadant Inc. | 44 |
4 |
| First Quality Tissue, LLC | 166 |
3 |
| Valmet AB | 561 |
3 |
| Andritz AG | 247 |
2 |
| Kimberly-clark Worldwide, Inc. | 5257 |
1 |
| Kyocera Corporation | 14451 |
1 |
| Effcom Oy | 6 |
1 |
| Johns Manville | 915 |
1 |
| Paperchine Inc. | 8 |
1 |
| Rochling Leripa Papertech GmbH & Co. KG | 17 |
1 |
| Teknologian Tutkimuskeskus VTT Oy | 592 |
1 |
| USG Interiors, LLC | 319 |
1 |
| Valmet Technologies, Inc. | 134 |
1 |
| Valmet Technologies Oy | 289 |
1 |
| Coldwater Seals, Inc. | 3 |
1 |
| Other owners | 0 |