Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4869938 | Polypropylene sheet for press-through packages, production process thereof, and polypropylene resin composition | Katsuyuki Usami, Toru Ueki, Hajime Sentoku, Takashi Takahashi | 1989-09-26 |