Issued Patents 1989
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4863669 | Process for forming polyarylenethioether stretched blow-molded vessel | Toshitaka Kouyama, Takayuki Katto, Yo Iizuka, Zenya Shiiki | 1989-09-05 |
| 4841019 | Apparatus for producing polyarylenesulfides | Katsumi Horikosi | 1989-06-20 |
| 4814430 | Process for producing poly(arylene sulfide) of reduced alkali metal content | Yo Iizuka, Takayuki Katto, Zenya Shiiki | 1989-03-21 |
| 4812539 | Polyarylene sulfide preparation in titanium reaction vessel with two distinct temperature ranges | Yo Iizuka, Takayuki Katto, Zenya Shiiki | 1989-03-14 |
| 4810566 | Highly crystallized molded polyarylene thioether and process for producing it | Yukichika Kawakami, Zenya Shiiki | 1989-03-07 |
| 4795671 | Para-phenylene sulfide block copolymers, process for the production of the same and use thereof | Zenya Shiiki, Takayuki Katto, Yo Iizuka, Toshitaka Kouyama | 1989-01-03 |