Issued Patents All Time
Showing 51–59 of 59 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6572451 | Spectacle lens machining method and apparatus | Hakaru Fujita, Isao Iizuka | 2003-06-03 |
| 6533418 | System for making spectacles to order | Yukihiro Izumitani, Toshihisa Akaba, Isao Iizuka, Shigeru Watanabe | 2003-03-18 |
| 6340226 | Spectacles accommodating interchangeable/replaceable lens | Toshihisa Akaba, Kazumichi Kurihara, Hakaru Fujita, Youichi Ishiguro, Isao Iizuka +1 more | 2002-01-22 |
| 5719179 | Compound GEX1 | Tamio Mizukami, Tetsuo Yoshida, Youichi Uosaki, Keiko Ochiai, Shiro Akinaga | 1998-02-17 |
| 5665703 | GE3 compound | Tamio Mizukami, Tetsuo Yoshida, Tsutomu Agatsuma, Keiko Ochiai, Shiro Akinaga | 1997-09-09 |
| 4870146 | Process for producing a light color high softening point hydrocarbon resin | Tetsuo Fujii, Michio Saito, Motoaki Munekata, Akio Kiyohara | 1989-09-26 |
| 4857617 | Process for producing a high softening point hydrocarbon resin | Koji Tanaka, Katsuo Takemoto | 1989-08-15 |
| 4684711 | Process for producing a hydrocarbon resin | Koji Tanaka, Michio Saito, Akio Kiyohara | 1987-08-04 |
| 4680349 | Method of polymerizing vinyl monomers with coated reactor | Tetsuya Asahi, Hiroshi Kaneko, Akio Kiyohara, Tooru Iwashita | 1987-07-14 |