Issued Patents 2002
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6467310 | Method for producing optical fiber base material ingot by grinding while core portion central axis is brought into line with rotational axis of grinding machine | Masami Terashima, Hideo Hirasawa | 2002-10-22 |
| 6467311 | Double flame polishing method for fiber preforms | Hideki Fujii, Takaaki Nagao, Shoji Hoshino, Hideo Hirasawa | 2002-10-22 |
| 6442978 | Apparatus for sintering a porous glass base material and a method therefor | Takeshi Kamio, Hiroyuki Koide, Hiroshi Tsumura, Hideo Hirasawa | 2002-09-03 |
| 6386001 | Optical fiber manufacture method including elongating a preform in a vertical direction and a horizontal direction | Yoshiaki Shimizu, Takaaki Nagano, Hideo Hirasawa, Masataka Watanabe, Kazuhisa Hatayama +5 more | 2002-05-14 |
| 6354112 | Method of depositing glass soot with controlling reaction chamber humidity to prevent accumulation of excess soot | Yasuhiro Nakashima, Hideo Hirasawa | 2002-03-12 |