- 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: 429
10-year publication summary
|
28
|
28
|
22
|
23
|
22
|
15
|
27
|
11
|
5
|
4
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Samsung Display Co., Ltd. | 37493 |
18 |
| Novaled GmbH | 465 |
15 |
| BASF SE | 21131 |
12 |
| Merck Patent GmbH | 5743 |
12 |
| Purdue Research Foundation | 3814 |
12 |
| FUJIFILM Corporation | 30137 |
10 |
| Max-Planck-Gesellschaft zur Forderung der Wissenschaften e.V. | 1822 |
8 |
| Canon Kabushiki Kaisha | 7205 |
8 |
| Tetraphase Pharmaceuticals, Inc. | 52 |
7 |
| LG Chem, Ltd. | 17778 |
6 |
| Idemitsu Kosan Co., Ltd. | 4223 |
6 |
| Universal Display Corporation | 2015 |
6 |
| Gilead Sciences, Inc. | 2161 |
5 |
| UDC Ireland Limited | 464 |
5 |
| Capacitor Sciences Incorporated | 57 |
4 |
| Dalian University of Technology | 1570 |
4 |
| Duk San Neolux Co., Ltd. | 676 |
4 |
| Hodogaya Chemical Co., Ltd. | 432 |
4 |
| Nippon Kayaku Kabushiki Kaisha | 1462 |
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 | 174 |
4 |
| Other owners | 275 |