Issued Patents All Time
Showing 1–24 of 24 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6734276 | Polyimide and circuit substrate comprising the same | Wataru Yamashita, Katsuji Watanabe | 2004-05-11 |
| 5969138 | Pyrrolidinone derivatives | Naruyoshi Mita, Hiroshi Nagase, Hajime Iizuka, Kazuya Sakai, Kazutoshi Horikomi +2 more | 1999-10-19 |
| 5750229 | Phthalocyanine compound and optical recording medium containing it | Hideki Umehara, Kenichi Sugimoto, Ryu Oi, Hisato Itoh | 1998-05-12 |
| 5695911 | Optical recording medium | Hisato Itoh, Akio Karasawa, Kenichi Sugimoto, Shin Aihara | 1997-12-09 |
| 5646273 | Phthalocyanine compound and optical recording medium containing it | Hideki Umehara, Kenichi Sugimoto, Ryu Oi, Hisato Itoh | 1997-07-08 |
| 5582774 | Alkylphthalocyanine near-infrared absorbers and recording/display materials using the same | Hisato Itoh, Katashi Enomoto, Tsutomu Nishizawa | 1996-12-10 |
| 5538985 | Pyrrolidinone derivatives | Hajime Iizuka, Yoji Aoki, Norio Ohto, Kazutoshi Horikomi, Takaichi Miwa +2 more | 1996-07-23 |
| 5449587 | Compact disk-write once type optical recording media | Hisato Itoh, Katashi Enomoto, Tsutomu Nishizawa | 1995-09-12 |
| 5446141 | Alkylphthalocyanine near-infrared absorbers and recording/display materials using the same | Hisato Itoh, Katashi Enomoto, Tsutomu Nishizawa | 1995-08-29 |
| 5446142 | Phthalocyanine and naphthalocyanine light-absorbing compound and optical recording medium containing same | Hisato Itoh, Kenichi Sugimoto, Ryu Oi, Hideki Umehara, Shin Aihara | 1995-08-29 |
| 5409634 | Near infrared absorbers and display/recording materials using the same | Hisato Itoh, Katashi Enomoto, Tutomu Nishizawa | 1995-04-25 |
| 5387678 | Halogenation process of phthalocyanine and halogenated alkoxyphthalocyanine | Hisato Itoh, Shin Aihara | 1995-02-07 |
| 5380842 | Phthalocyanine compounds and usage thereof | Hisato Itoh, Akio Karasawa, Kenichi Sugimoto, Shin Aihara | 1995-01-10 |
| 5358833 | Amorphous phthalocyanine compound or mixture of amorphous phthalocyanine compounds, and method for preparing same | Hisato Itoh, Shin Aihara, Kenichi Sugimoto | 1994-10-25 |
| 5350843 | Halogenated phthalocyanine compound, method for preparing same | Hisato Itoh, Shin Aihara, Kenichi Sugimoto | 1994-09-27 |
| 5334714 | Method for preparing alkoxyphthalocyanine | Kenichi Sugimoto, Shin Aihara, Hisato Itoh, Mansuke Matsumoto, Toshihiro Masaoka +1 more | 1994-08-02 |
| 5296162 | Near infrared absorbers and display/recording materials using the same | Hisao Itoh, Katashi Enomoto, Tutomu Nishizawa | 1994-03-22 |
| 5280114 | Halogenation of alkoxyphthalocyanine | Hisato Itoh, Shin Aihara | 1994-01-18 |
| 5270463 | Halogenated alkoxyphthalocyanines | Hisato Itoh, Katashi Enomoto, Tutomu Nishizawa | 1993-12-14 |
| 5220010 | Method for preparation alkoxyphthalocyanine | Kenichi Sugimoto, Shin Athara, Hisato Itoh, Mansuke Matsumoto, Toshihiro Masaoka +1 more | 1993-06-15 |
| 5124067 | Near infrared absorbers and display/recording materials using the same | Hisao Itoh, Katashi Enomoto, Tutomu Nishizawa | 1992-06-23 |
| 5024926 | Alkylphthalocyanine near-infrared absorbers and recording/display materials using the same | Hisato Itoh, Katashi Enomoto, Tsutomu Nishizawa | 1991-06-18 |
| 4970021 | Phthalocyanine compounds and utility thereof | Masakatsu Nakatsuka, Tsutomu Nishizawa, Hisato Itoh, Katashi Enomoto | 1990-11-13 |
| 4960538 | 1,2-naphthalocyanine near-infrared absorbent and recording/display materials using same | Hisato Itoh, Katashi Enomoto, Masakatsu Nakatsuka, Tsutomu Nishizawa | 1990-10-02 |