Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7427387 | High-purity quartz powder, process for producing the same, and glass molding | Keiji Yamahara, Takashi Yamaguchi, Yutaka Mori | 2008-09-23 |
| 7074376 | Silica gel | Takashi Yamaguchi, Takayuki Yoshimori, Hanako Kato | 2006-07-11 |
| 7063826 | High-purity quartz powder, process for producing the same, and glass molding | Keiji Yamahara, Takashi Yamaguchi, Yutaka Mori | 2006-06-20 |
| 6838068 | Silica gel | Takashi Yamaguchi, Takayuki Yoshimori, Hanako Kato | 2005-01-04 |
| 6225245 | Silica gel, synthetic quartz glass powder and shaped product of quartz glass | Akira Utsunomiya, Akihiro Takazawa, Takashi Moriyama | 2001-05-01 |
| 6131409 | Process for producing a high purity synthetic quartz | Takanobu Katsuki, Akihiro Takazawa, Hanako Kato, Akira Utsunomiya | 2000-10-17 |
| 6129899 | Processes for producing synthetic quartz powder and producing shaped quartz glass | Masaru Shimoyama, Hiroshi Maeda, Shoji Oishi | 2000-10-10 |
| 6110852 | Process for producing synthetic quartz glass powder | Hozumi Endo, Akira Utsunomiya, Hiroaki Nagai, Toshifumi Yoshikawa, Shoji Oishi +1 more | 2000-08-29 |
| 6071838 | Silica gel, synthetic quartz glass powder, quartz glass shaped product molding, and processes for producing these | Hozumi Endo, Akira Utsunomiya, Masaru Shimoyama | 2000-06-06 |
| 5574172 | Process for producing halogenated phthalic anhydride | Hitoshi Matsuda | 1996-11-12 |
| 5258530 | Process for producing biphenyltetracarboxylic dianhydride | Hitoshi Matsuda | 1993-11-02 |
| 5095144 | Process for dimerizing aromatic halogen compound | Keiichi Sato, Takahiko Takewaki | 1992-03-10 |
| 4900843 | Method for dimerization of aromatic halide compounds | Mitsumasa Kitai, Shigenori Kawamura, Masumi Hino, Keiichi Sato | 1990-02-13 |