Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4844589 | Lenses having plural contiguous refractive index distribution substrates and method of manufacture | Yoshiyuki Asahara, Shigeaki Omi, Seiichi Shingaki, Shin Nakayama | 1989-07-04 |