- 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: 841
10-year publication summary
|
85
|
66
|
66
|
69
|
66
|
44
|
46
|
44
|
34
|
10
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Tokuyama Corporation | 1248 |
108 |
| Transitions Optical, Inc. | 317 |
78 |
| Boe Technology Group Co., Ltd. | 35384 |
34 |
| Hoya Lens Thailand Ltd. | 447 |
29 |
| Solutia Canada Inc | 45 |
26 |
| FUJIFILM Corporation | 27102 |
20 |
| Transitions Optical Limited | 133 |
20 |
| Hoya Optical Labs of America, Inc. | 120 |
20 |
| Essilor International (compagnie Generale D'optique) | 2918 |
19 |
| LG Chem, Ltd. | 17205 |
18 |
| Rodenstock GmbH | 356 |
18 |
| Cheil Industries Inc. | 944 |
17 |
| Mitsui Chemicals, Inc. | 3134 |
17 |
| LG Innotek Co., Ltd. | 6758 |
15 |
| Samsung SDI Co., Ltd. | 6671 |
12 |
| Hoya Corporation | 2822 |
12 |
| Shenzhen China Star Optoelectronics Technology Co., Ltd. | 8635 |
11 |
| Johnson & Johnson Vision Care, Inc. | 1255 |
10 |
| Samsung Display Co., Ltd. | 30585 |
10 |
| 3m Innovative Properties Company | 18406 |
8 |
| Other owners | 339 |