| # | Country | Total Patents | |
|---|---|---|---|
| #1 | EPO (European Patent Office) | 2 | |
| #2 | Hong Kong | 2 | |
| #3 | Singapore | 2 | |
| #4 | United States | 2 | |
| #5 | WIPO (World Intellectual Property Organization) | 2 | |
| #6 | Australia | 1 | |
| #7 | Canada | 1 | |
| #8 | New Zealand | 1 |
| # | Industry | |
|---|---|---|
| #1 | Optics | |
| #2 | Basic materials chemistry | |
| #3 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Spectacles | |
| #2 | Pigments | |
| #3 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Silva Donald E | 6 |
| #2 | Yeo Kok Kee | 4 |
| #3 | Kee Yeo K | 2 |
| #4 | Van Ligten Raoul F | 2 |
| #5 | Van Ligten Raoul Fredrik | 2 |
| #6 | Sumargo Jimmy | 1 |
| #7 | Ligten Raoul Fredrik Van | 1 |
| #8 | Zheng Jianwei | 1 |
| #9 | Prihantoro Araz | 1 |
| #10 | Arykwan Angelina Octaviani | 1 |
| Publication | Filing date | Title |
|---|---|---|
| WO2009072988A1 | Encapsulated photochromic dyes | |
| SG164594G | Method of designing progressive addition lenses | |
| US4787733A | Method for designing progressive addition lenses | |
| US4426139A | Progressive addition lens |