- All sections
- B - Performing operations; transporting
- 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: 2144
10-year publication summary
|
125
|
139
|
129
|
150
|
171
|
141
|
185
|
189
|
170
|
57
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| NGK Insulators, Ltd. | 4589 |
207 |
| Ibiden Co., Ltd. | 1724 |
196 |
| Sumitomo Chemical Company, Limited | 8808 |
104 |
| Hitachi Metals, Ltd. | 2175 |
59 |
| Donaldson Company, Inc. | 1513 |
57 |
| Corning Incorporated | 9932 |
53 |
| Murata Manufacturing Co., Ltd. | 22355 |
37 |
| Hollingsworth & Vose Company | 274 |
36 |
| Denso Corporation | 23338 |
33 |
| MANN+HUMMEL GmbH | 1682 |
21 |
| LG Electronics Inc. | 69257 |
17 |
| Ahlstrom Oyj | 64 |
16 |
| 3m Innovative Properties Company | 18406 |
15 |
| Saint-Gobain Centre de Recherches et d'Etudes Europeen | 475 |
14 |
| Ahlstrom-munksjo Oyj | 242 |
14 |
| Kyocera Corporation | 12735 |
13 |
| NV Bekaert SA | 750 |
13 |
| Samsung Electronics Co., Ltd. | 131630 |
12 |
| Honda Motor Co., Ltd. | 24537 |
12 |
| Cummins Filtration IP, Inc. | 812 |
11 |
| Other owners | 1204 |