Issued Patents All Time
Showing 26–34 of 34 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6306500 | Porous optical fiber base materials, optical fiber base materials and methods for producing them | Haruyoshi Kuwabara, Hideo Hirasawa | 2001-10-23 |
| 6220057 | Apparatus and method for drawing a glass ingot | Waichi Yamamura, Hideo Hirasawa, Soichiro Kemmochi | 2001-04-24 |
| 6178778 | Method of stretching an optical fiber preform with monitoring the diameter at two locations | Soichiro Kenmochi, Hideo Hirasawa, Akihiko Suzuki, Waichi Yamamura, Yoshiaki Shimizu | 2001-01-30 |
| 6134922 | Method for drawing a glass ingot | Hideo Hirasawa | 2000-10-24 |
| 6131414 | Method for making a preform for optical fibers by drawing a mother ingot | Yoshiaki Shimizu, Hideo Hirasawa | 2000-10-17 |
| 5958102 | Apparatus and method for making an optical fiber preform using a correction pass | Hideo Hirasawa | 1999-09-28 |
| 5408309 | Apparatus and method for inspecting elliplicity and eccentricity of optical fiber preforms | Kazuo Koya | 1995-04-18 |
| 5406374 | Method for detecting bubbles and inclusions present in optical fiber preform and apparatus for detecting same | Kazuo Koya | 1995-04-11 |
| 5078488 | Method and apparatus for determining refractive index distribution | Ichirou Yamaguchi, Kazuo Koya, Toshiyuki Suzuki | 1992-01-07 |