Issued Patents All Time
Showing 26–37 of 37 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6618116 | Optical head device and a diffraction element suitable for the device, and a method of manufacturing the diffraction element and the optical head device | Koichi Murata | 2003-09-09 |
| 6580674 | Phase shifter and optical head device mounted with the same | Takehiko Nishiyama, Naomitsu Umemura, Masahiro Murakawa, Yoshiharu Ooi, Yuzuru Tanabe | 2003-06-17 |
| 6304312 | Optical head, method of manufacturing the same, and diffraction element suitable therefor | Yuzuru Tanabe, Tomoki Gunjima, Hiroki Hotaka | 2001-10-16 |
| 6271966 | Optical head device including an optically anisotropic diffraction grating and process for its production | Yuzuru Tanabe, Tomoki Gunjima, Hiroki Hotaka | 2001-08-07 |
| 6180028 | Liquid-crystal composition and polymeric liquid crystal obtained by polymerizing the same | Hiroki Hotaka, Tomoki Gunjima, Mitsuru Kurosawa, Yuzuru Tanabe | 2001-01-30 |
| 6145133 | Swimming goggles | Shunji Fukasawa | 2000-11-14 |
| 6118586 | Optical head device including an optically anisotropic diffraction grating and production method thereof | Yuzuru Tanabe, Tomoki Gunjima, Hiroki Hotaka | 2000-09-12 |
| 6092895 | Lens frame assembly for a diving mask | Taro Fujima | 2000-07-25 |
| 5329643 | Diving face mask | — | 1994-07-19 |
| D335365 | Diver's mask | — | 1993-05-04 |
| D318476 | Diver's mask | — | 1991-07-23 |
| D266031 | Diver's mask | — | 1982-09-07 |