Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4923904 | Process for producing polyurethane foam | Hajime Hasegawa, Atsuo Takei, Toru Okuyama | 1990-05-08 |
| 4666949 | Thermochromic polyurethane foam | Goro Shimizu, Yoshimi Hayashi, Hajime Hasegawa, Atsuo Takei, Tohru Okuyama +1 more | 1987-05-19 |