Issued Patents 1997
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5693115 | Process for production of glass preform for optical fiber including consolidating in a furnace with a temperature gradient | Toshio Danzuka, Yuichi Ohga, Sumio Hoshino, Ichiro Tsuchiya | 1997-12-02 |
| 5676725 | Method of manufacturing single-mode optical fiber | Sumio Hoshino, Toshio Danzuka | 1997-10-14 |
| 5627933 | Optical waveguide and process for producing it | Maki Inai, Akira Inoue, Masakazu Shigehara | 1997-05-06 |
| 5591870 | Process for producing a vanadium-phosphorus oxide catalyst precursor | Masakatsu Hatano, Masayoshi Murayama, Kenji Shima | 1997-01-07 |