- All sections
- D - Textiles; paper
- D21F - Paper-making machines; methods 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: 54
10-year publication summary
|
3
|
4
|
6
|
10
|
3
|
3
|
1
|
0
|
1
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Voith Patent GmbH | 2734 |
12 |
| Metso Paper, Inc. | 478 |
10 |
| AstenJohnson, Inc. | 134 |
5 |
| Seiko Epson Corporation | 18984 |
4 |
| Kadant Inc. | 45 |
4 |
| Effcom Oy | 9 |
3 |
| Valmet AB | 495 |
3 |
| Andritz AG | 227 |
2 |
| Kimberly-clark Worldwide, Inc. | 5520 |
1 |
| Kyocera Corporation | 13335 |
1 |
| Johns Manville | 964 |
1 |
| Oji Paper Co., Ltd. | 71 |
1 |
| Paperchine Inc. | 10 |
1 |
| Rochling Leripa Papertech GmbH & Co. KG | 17 |
1 |
| Teknologian Tutkimuskeskus VTT Oy | 501 |
1 |
| Valmet Technologies, Inc. | 160 |
1 |
| Valmet Technologies Oy | 290 |
1 |
| Coldwater Seals, Inc. | 7 |
1 |
| Horikawa Engineering Works Ltd. | 1 |
1 |
| Other owners | 0 |