- 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: 830
10-year publication summary
|
66
|
69
|
66
|
45
|
46
|
45
|
38
|
36
|
33
|
15
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Tokuyama Corporation | 1477 |
119 |
| Transitions Optical, Inc. | 236 |
46 |
| Hoya Lens Thailand Ltd. | 611 |
42 |
| Boe Technology Group Co., Ltd. | 44029 |
31 |
| Transitions Optical Limited | 175 |
26 |
| Solutia Canada Inc | 44 |
26 |
| FUJIFILM Corporation | 30514 |
19 |
| Mitsui Chemicals, Inc. | 3246 |
19 |
| Rodenstock GmbH | 396 |
19 |
| Essilor International (compagnie Generale D'optique) | 2994 |
18 |
| Hoya Optical Labs of America, Inc. | 144 |
18 |
| LG Chem, Ltd. | 17921 |
17 |
| Cheil Industries Inc. | 813 |
17 |
| LG Innotek Co., Ltd. | 8466 |
15 |
| Samsung Display Co., Ltd. | 38627 |
12 |
| Samsung SDI Co., Ltd. | 10589 |
12 |
| Shenzhen China Star Optoelectronics Technology Co., Ltd. | 8471 |
11 |
| Hoya Corporation | 2721 |
10 |
| Flo Optics Ltd | 24 |
9 |
| Beijing BOE Display Technology Co., Ltd. | 2986 |
8 |
| Other owners | 336 |