- All sections
- C - Chemistry; metallurgy
- 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: 450
10-year publication summary
|
26
|
26
|
31
|
28
|
25
|
24
|
23
|
15
|
25
|
3
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Samsung Display Co., Ltd. | 30585 |
18 |
| Novaled GmbH | 369 |
15 |
| BASF SE | 19740 |
13 |
| Purdue Research Foundation | 3277 |
13 |
| Merck Patent GmbH | 5909 |
11 |
| FUJIFILM Corporation | 27102 |
10 |
| President and Fellows of Harvard College | 5792 |
9 |
| Max-Planck-Gesellschaft zur Forderung der Wissenschaften e.V. | 1657 |
9 |
| Tetraphase Pharmaceuticals, Inc. | 53 |
8 |
| Canon Kabushiki Kaisha | 6884 |
8 |
| LG Chem, Ltd. | 17205 |
6 |
| BASF AG | 1258 |
6 |
| Idemitsu Kosan Co., Ltd. | 3995 |
6 |
| Nippon Kayaku Kabushiki Kaisha | 1400 |
6 |
| Gilead Sciences, Inc. | 1879 |
5 |
| Inotek Pharmaceuticals Corporation | 26 |
5 |
| UDC Ireland Limited | 496 |
5 |
| Universal Display Corporation | 1678 |
5 |
| Capacitor Sciences Incorporated | 65 |
4 |
| Dalian University of Technology | 1387 |
4 |
| Other owners | 284 |