- 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: 2230
10-year publication summary
|
135
|
125
|
142
|
169
|
143
|
184
|
186
|
171
|
162
|
96
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| NGK Insulators, Ltd. | 5107 |
199 |
| Ibiden Co., Ltd. | 1730 |
157 |
| Sumitomo Chemical Company, Limited | 9086 |
106 |
| Corning Incorporated | 10327 |
59 |
| Donaldson Company, Inc. | 1603 |
59 |
| Hitachi Metals, Ltd. | 1970 |
55 |
| Hollingsworth & Vose Company | 296 |
42 |
| Murata Manufacturing Co., Ltd. | 24829 |
40 |
| Denso Corporation | 24562 |
33 |
| MANN+HUMMEL GmbH | 1769 |
21 |
| LG Electronics Inc. | 73690 |
20 |
| Samsung Electronics Co., Ltd. | 147983 |
17 |
| Ahlstrom Oyj | 109 |
17 |
| Saint-Gobain Centre de Recherches et d'Etudes Europeen | 491 |
14 |
| SK Innovation Co., Ltd. | 1362 |
14 |
| Ahlstrom-munksjo Oyj | 221 |
14 |
| SK Geo Centric Co., Ltd. | 316 |
14 |
| Kyocera Corporation | 13988 |
13 |
| NV Bekaert SA | 744 |
13 |
| 3m Innovative Properties Company | 17770 |
12 |
| Other owners | 1311 |