- All sections
- G - Physics
- G02B - Optical elements, systems or apparatus
- G02B 5/23 - Photochromic filters
Patent holdings for IPC class G02B 5/23
Total number of patents in this class: 824
10-year publication summary
|
64
|
68
|
64
|
42
|
46
|
44
|
33
|
34
|
32
|
3
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Tokuyama Corporation | 1450 |
116 |
| Transitions Optical, Inc. | 250 |
51 |
| Hoya Lens Thailand Ltd. | 590 |
42 |
| Boe Technology Group Co., Ltd. | 42421 |
31 |
| Solutia Canada Inc | 44 |
26 |
| Transitions Optical Limited | 165 |
24 |
| FUJIFILM Corporation | 30010 |
19 |
| Rodenstock GmbH | 388 |
19 |
| Mitsui Chemicals, Inc. | 3232 |
18 |
| Essilor International (compagnie Generale D'optique) | 2979 |
18 |
| LG Chem, Ltd. | 17741 |
17 |
| Cheil Industries Inc. | 828 |
17 |
| Hoya Optical Labs of America, Inc. | 141 |
17 |
| LG Innotek Co., Ltd. | 8023 |
15 |
| Samsung Display Co., Ltd. | 37127 |
12 |
| Samsung SDI Co., Ltd. | 9181 |
12 |
| Hoya Corporation | 2756 |
11 |
| Shenzhen China Star Optoelectronics Technology Co., Ltd. | 8475 |
11 |
| Beijing BOE Display Technology Co., Ltd. | 2896 |
8 |
| Flo Optics Ltd | 14 |
8 |
| Other owners | 332 |