- 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: 821
10-year publication summary
|
66
|
66
|
69
|
66
|
45
|
46
|
44
|
34
|
34
|
18
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Tokuyama Corporation | 1383 |
116 |
| Transitions Optical, Inc. | 256 |
54 |
| Hoya Lens Thailand Ltd. | 546 |
34 |
| Boe Technology Group Co., Ltd. | 40912 |
31 |
| Solutia Canada Inc | 44 |
26 |
| Transitions Optical Limited | 160 |
24 |
| FUJIFILM Corporation | 29305 |
19 |
| Essilor International (compagnie Generale D'optique) | 3000 |
19 |
| Mitsui Chemicals, Inc. | 3222 |
18 |
| Hoya Optical Labs of America, Inc. | 138 |
18 |
| LG Chem, Ltd. | 17598 |
17 |
| Cheil Industries Inc. | 898 |
17 |
| Rodenstock GmbH | 383 |
17 |
| LG Innotek Co., Ltd. | 7610 |
15 |
| Samsung Display Co., Ltd. | 34539 |
12 |
| Samsung SDI Co., Ltd. | 8174 |
12 |
| Hoya Corporation | 2743 |
12 |
| Shenzhen China Star Optoelectronics Technology Co., Ltd. | 8478 |
11 |
| 3m Innovative Properties Company | 17857 |
8 |
| Beijing BOE Display Technology Co., Ltd. | 2784 |
8 |
| Other owners | 333 |