- All sections
- C - Chemistrymetallurgy
- C01B - Non-metallic elementscompounds thereof
- C01B 21/02 - Preparation of nitrogen
Patent holdings for IPC class C01B 21/02
Total number of patents in this class: 74
10-year publication summary
|
3
|
7
|
6
|
4
|
4
|
9
|
8
|
5
|
5
|
3
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Nederlandse Organisatie voor Toegepast-natuurwetenschappelijk Onderzoek TNO | 2376 |
4 |
| Saudi Arabian Oil Company | 13155 |
3 |
| Wisconsin Alumni Research Foundation | 3877 |
2 |
| Air Products and Chemicals, Inc. | 1423 |
2 |
| The Arizona Board of Regents on Behalf of the University of Arizona | 2157 |
2 |
| Casale SA | 609 |
2 |
| CFD Research Corporation | 58 |
2 |
| Kemira Oyj | 1206 |
2 |
| King Fahd University of Petroleum & Minerals | 176 |
2 |
| North Carolina State University | 1561 |
2 |
| Pioneer Astronautics | 17 |
2 |
| ThyssenKrupp Uhde GmbH | 331 |
2 |
| William Marsh Rice University | 1009 |
2 |
| Ekona Power Inc. | 53 |
2 |
| Elemental Recycling, Inc. | 10 |
2 |
| Samsung Electronics Co., Ltd. | 146092 |
1 |
| Mitsubishi Heavy Industries, Ltd. | 8715 |
1 |
| Raytheon Company | 8389 |
1 |
| The Board of Trustees of the Leland Stanford Junior University | 6408 |
1 |
| Uop LLC | 4244 |
1 |
| Other owners | 36 |