- All sections
- C - Chemistrymetallurgy
- C07D - Heterocyclic compounds
- C07D 221/18 - Ring systems of four or more rings
Patent holdings for IPC class C07D 221/18
Total number of patents in this class: 441
10-year publication summary
|
26
|
31
|
28
|
25
|
24
|
24
|
15
|
27
|
11
|
5
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Samsung Display Co., Ltd. | 34696 |
18 |
| Novaled GmbH | 441 |
15 |
| BASF SE | 20933 |
13 |
| Purdue Research Foundation | 3612 |
13 |
| Merck Patent GmbH | 5831 |
12 |
| FUJIFILM Corporation | 29367 |
10 |
| Max-Planck-Gesellschaft zur Forderung der Wissenschaften e.V. | 1774 |
8 |
| Canon Kabushiki Kaisha | 7056 |
8 |
| Tetraphase Pharmaceuticals, Inc. | 51 |
7 |
| LG Chem, Ltd. | 17632 |
6 |
| Idemitsu Kosan Co., Ltd. | 4219 |
6 |
| Universal Display Corporation | 1909 |
6 |
| President and Fellows of Harvard College | 5976 |
5 |
| Gilead Sciences, Inc. | 2036 |
5 |
| Nippon Kayaku Kabushiki Kaisha | 1432 |
5 |
| UDC Ireland Limited | 478 |
5 |
| Capacitor Sciences Incorporated | 58 |
4 |
| Dalian University of Technology | 1520 |
4 |
| Duk San Neolux Co., Ltd. | 651 |
4 |
| Hodogaya Chemical Co., Ltd. | 434 |
4 |
| Other owners | 283 |