Issued Patents All Time
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9835965 | Charge control agent and toner using same | Masaki Okubo, Ikuo Kimura, Motonori Tsuji, Takeshi Yamamoto, Masaya Tojo +2 more | 2017-12-05 |
| 9703223 | Toner, developer, and toner cartridge | Masaki Okubo, Motonori Tsuji, Masaya Tojo, Masafumi Asakai, Tetsuya Yoshida | 2017-07-11 |
| 8900785 | Charge control agent and toner using the same | Ikuo Kimura, Masaya Tojou, Kanae Hiraishi, Masafumi Asakai | 2014-12-02 |
| 8790855 | Charge control agent and toner using same | Ikuo Kimura, Motonori Tsuji, Masaya Tojo, Kanae Hiraishi | 2014-07-29 |
| 8624065 | Methods for producing oxidized cyclic phenol sulfides | Masateru Yasumura, Yoshikazu Aoki, Masafumi Umekawa, Naohiro Tarumoto | 2014-01-07 |
| 8263786 | Methods for producing cyclic phenol sulfides | Masateru Yasumura, Yoshikazu Aoki, Masafumi Umekawa, Naohiro Tarumoto | 2012-09-11 |
| 8232429 | Methods for producing oxidized cyclic phenol sulfides | Masateru Yasumura, Yoshikazu Aoki, Masafumi Umekawa, Naohiro Tarumoto | 2012-07-31 |
| 8222428 | Method for continuously producing oxidized cyclic phenol sulfides | Masateru Yasumura, Yoshikazu Aoki | 2012-07-17 |
| 7901858 | Mixed cyclic phenol sulfides, and charge control agents and toners using the same | Masateru Yasumura, Naohiro Tarumoto, Yoshikazu Aoki, Masafumi Umekawa, Masaki Okubo +2 more | 2011-03-08 |
| 7820832 | Oxidized mixed cyclic phenol sulfides, and charge control agents and toners using the same | Masateru Yasumura, Naohiro Tarumoto, Yoshikazu Aoki, Masafumi Umekawa, Masaki Okubo +2 more | 2010-10-26 |
| 7709172 | Oxidized mixed cyclic phenol sulfides, and charge control agents and toners using the same | Masateru Yasumura, Naohiro Tarumoto, Yoshikazu Aoki, Masafumi Umekawa, Masaki Okubo +2 more | 2010-05-04 |
| 7402369 | Mono azo iron complex compound, and charge controlling agent and toner using the same | Masaki Okubo, Hideyuki Otsuka, Kazuo Nemoto, Eisuke Yamada | 2008-07-22 |
| 5240898 | Heat sensitive recording material | Hiroyuki Yoshida, Masahiko Yamaguchi, Toshiyuki Abe | 1993-08-31 |
| 4798913 | Method for separating a trihalogenobenzene isomer | Kikuo Otomo, Masashi Yamagushi, Hiroki Tokunaga | 1989-01-17 |