- 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: 424
10-year publication summary
|
31
|
28
|
25
|
24
|
24
|
15
|
28
|
11
|
5
|
7
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Samsung Display Co., Ltd. | 38544 |
18 |
| Novaled GmbH | 482 |
15 |
| BASF SE | 21313 |
12 |
| Purdue Research Foundation | 3908 |
12 |
| Merck Patent GmbH | 5725 |
10 |
| FUJIFILM Corporation | 30479 |
10 |
| Max-Planck-Gesellschaft zur Forderung der Wissenschaften e.V. | 1843 |
8 |
| Canon Kabushiki Kaisha | 7303 |
8 |
| Tetraphase Pharmaceuticals, Inc. | 52 |
7 |
| UDC Ireland Limited | 510 |
7 |
| LG Chem, Ltd. | 17926 |
6 |
| Idemitsu Kosan Co., Ltd. | 4228 |
6 |
| Universal Display Corporation | 2077 |
6 |
| Gilead Sciences, Inc. | 2219 |
5 |
| Capacitor Sciences Incorporated | 56 |
4 |
| Dalian University of Technology | 1592 |
4 |
| Duk San Neolux Co., Ltd. | 702 |
4 |
| Hodogaya Chemical Co., Ltd. | 430 |
4 |
| Nippon Kayaku Kabushiki Kaisha | 1454 |
4 |
| The Provost, Fellows, Foundation Scholars, and The Other Members of Board, of The College of The Holy and Undivided Trinity of Queen Elizabeth, Near Dublin | 178 |
4 |
| Other owners | 270 |