Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5032000 | Gradient index-type optical device and process for production thereof | Kohei Nakata, Takashi Serizawa, Kazuyoshi Nagao, Haruo Tomono | 1991-07-16 |
| 4971423 | Gradient-index-type optical device | Kohei Nakata, Takashi Serizawa, Haruo Tomono | 1990-11-20 |
| 4946724 | Vitreous film and heat-mode optical recording medium using same | Kazuyoshi Nagao, Yasuo Takahashi, Takashi Noma | 1990-08-07 |
| 4844589 | Lenses having plural contiguous refractive index distribution substrates and method of manufacture | Yoshiyuki Asahara, Hiroyuki Sasai, Shigeaki Omi, Shin Nakayama | 1989-07-04 |
| 4767435 | Process for producing transparent glass product having refractive index gradient | Shigeaki Omi, Yoshiyuki Asahara, Shin Nakayama, Kenji Nakagawa, Tetsuro Izumitani +1 more | 1988-08-30 |
| 4640699 | Process for producing glass product having gradient of refractive index | Shigeaki Ohmi, Hiroyuki Sakai, Yoshiyuki Asahara | 1987-02-03 |
| 4563205 | Process for the production of slab-shaped lens having gradient of refractive index in thickness direction only | Yoshiyuki Asahara, Hiroshi Sakai, Shigeaki Ohmi | 1986-01-07 |
| 4525189 | Process for producing glass product having gradient of refractive index | Shigeaki Ohmi, Hiroyuki Sakai, Yoshiyuki Asahara | 1985-06-25 |