Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE34455 | Large-aperture single lens with aspherical surfaces | Norikazu Arai, Tadashi Kojima | 1993-11-23 |
| D334728 | Portable planter for growing small plants | Takeshi Kubodera, Takako Inose | 1993-04-13 |
| 5190287 | Jigsaw puzzle toy using blocks | — | 1993-03-02 |
| 4830475 | Focusing means for a zoom lens group | Tadashi Kojima, Makoto Banno | 1989-05-16 |
| 4667962 | Children's block toy | — | 1987-05-26 |
| 4501475 | Zoom lens | Hisao Fujita | 1985-02-26 |
| 4498741 | Compact, wide magnification-variable zoom lens system | — | 1985-02-12 |
| 4449792 | Large-aperture single lens with aspherical surfaces | Norikazu Arai, Tadashi Kojima | 1984-05-22 |
| 4437732 | Wide magnification-variable range zoom lens system | — | 1984-03-20 |
| 4368381 | Numeral adding toy | — | 1983-01-11 |
| 4350416 | Compact zoom lens | — | 1982-09-21 |
| 4273541 | Clock for educational purposes | — | 1981-06-16 |
| 4258477 | Multiplication study device | — | 1981-03-31 |