| # | Country | Total Patents | |
|---|---|---|---|
| #1 | EPO (European Patent Office) | 7 | |
| #2 | Brazil | 5 | |
| #3 | Canada | 5 | |
| #4 | Australia | 4 | |
| #5 | Singapore | 4 | |
| #6 | Denmark | 3 | |
| #7 | Italy | 3 | |
| #8 | United States | 3 | |
| #9 | China | 2 | |
| #10 | Republic of Korea | 2 | |
| #11 | Philippines | 2 | |
| #12 | WIPO (World Intellectual Property Organization) | 2 | |
| #13 | Spain | 1 | |
| #14 | France | 1 | |
| #15 | United Kingdom | 1 | |
| #16 | Hong Kong | 1 | |
| #17 | Malaysia | 1 | |
| #18 | Norway | 1 | |
| #19 | Taiwan | 1 |
| # | Industry | |
|---|---|---|
| #1 | Optics |
| # | Technology | |
|---|---|---|
| #1 | Spectacles |
| # | Name | Total Patents |
|---|---|---|
| #1 | Negishi Tohru | 42 |
| #2 | Saitoh Masatoshi | 4 |
| #3 | Tohru Negishi | 3 |
| #4 | Masatoshi Saitoh | 2 |
| #5 | Negishi Doru | 1 |
| Publication | Filing date | Title |
|---|---|---|
| TW387994B | Integral vertical plane adjusting mechanism for an eyeglass frame with multifocal lenses | |
| SG71907A1 | Ophthalmic mounting for bifocal lenses and nose pads therefor | |
| AU7045696A | Ophthalmic mounting for bifocal lenses | |
| US4861151A | Frame for multifocal spectacles | |
| BR8307460A | Multifocal sunglasses | |
| WO8400618A1 | Multiple focus spectacles frame | |
| WO8203696A1 | Spectacle frame for multi-focus spectacles |