- All sections
- C - Chemistrymetallurgy
- C01B - Non-metallic elementscompounds thereof
- C01B 21/04 - Purification or separation of nitrogen
Patent holdings for IPC class C01B 21/04
Total number of patents in this class: 213
10-year publication summary
|
17
|
19
|
22
|
15
|
16
|
15
|
21
|
9
|
14
|
10
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Air Products and Chemicals, Inc. | 1474 |
9 |
| Hamilton Sundstrand Corporation | 5014 |
8 |
| ExxonMobil Research And Engineering Company | 2407 |
7 |
| L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude | 4118 |
7 |
| California Institute of Technology | 4037 |
6 |
| Micro Control Systems Ltd | 8 |
6 |
| Atlas Copco Airpower, naamloze vennootschap | 1081 |
5 |
| Pacific Consolidated Industries, LLC | 20 |
5 |
| Taiyo Nippon Sanso Corporation | 351 |
5 |
| NGK Insulators, Ltd. | 5239 |
3 |
| Arizona Board of Regents on behalf of Arizona State University | 2941 |
3 |
| Entegris, Inc. | 2007 |
3 |
| Qingdao Haier Joint Stock Co., Ltd. | 596 |
3 |
| System Instruments Co., Ltd. | 25 |
3 |
| National Technology & Engineering Solutions of Sandia, LLC | 1955 |
3 |
| Topsoe A/S | 1049 |
3 |
| Beijing Carbon Cycle Technology | 3 |
3 |
| GM Global Technology Operations LLC | 16155 |
2 |
| Applied Materials, Inc. | 20406 |
2 |
| Adsorption Technology Industries, Ltd. | 3 |
2 |
| Other owners | 125 |