| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 2 | |
| #2 | France | 2 | |
| #3 | United Kingdom | 2 | |
| #4 | Italy | 2 | |
| #5 | United States | 2 | |
| #6 | Australia | 1 | |
| #7 | Switzerland | 1 | |
| #8 | Hong Kong | 1 | |
| #9 | Republic of Korea | 1 |
| # | Industry | |
|---|---|---|
| #1 | Optics |
| # | Technology | |
|---|---|---|
| #1 | Optical systems |
| # | Name | Total Patents |
|---|---|---|
| #1 | Yabe Shinji | 9 |
| #2 | Shinji Yabe | 1 |
| #3 | Seijymy Kaoru | 1 |
| #4 | Seiyama Kaoru | 1 |
| Publication | Filing date | Title |
|---|---|---|
| KR860000777B1 | Macro-focussing rear converter lens | |
| US3877796A | Rear converter lens |