- All sections
- B - Performing operationstransporting
- B01D - Separation
- B01D 39/20 - Other self-supporting filtering material of inorganic material, e.g. asbestos paper or metallic filtering material of non-woven wires
Patent holdings for IPC class B01D 39/20
Total number of patents in this class: 2253
10-year publication summary
|
130
|
150
|
172
|
146
|
189
|
192
|
176
|
170
|
131
|
74
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| NGK Insulators, Ltd. | 5174 |
183 |
| Ibiden Co., Ltd. | 1680 |
142 |
| Sumitomo Chemical Company, Limited | 8965 |
106 |
| Corning Incorporated | 10538 |
60 |
| Donaldson Company, Inc. | 1607 |
52 |
| Murata Manufacturing Co., Ltd. | 25917 |
44 |
| Hollingsworth & Vose Company | 301 |
43 |
| Hitachi Metals, Ltd. | 1822 |
39 |
| Denso Corporation | 25746 |
33 |
| Ahlstrom Oyj | 199 |
23 |
| Samsung Electronics Co., Ltd. | 159029 |
21 |
| LG Electronics Inc. | 76087 |
21 |
| MANN+HUMMEL GmbH | 1814 |
21 |
| Mirai Casting America Inc. | 87 |
18 |
| SK Innovation Co., Ltd. | 1496 |
14 |
| Ahlstrom-munksjo Oyj | 152 |
14 |
| SK Geo Centric Co., Ltd. | 276 |
14 |
| Kyocera Corporation | 14451 |
13 |
| Entegris, Inc. | 2024 |
13 |
| Saint-Gobain Centre de Recherches et d'Etudes Europeen | 496 |
13 |
| Other owners | 1366 |