Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5079276 | Method of manufacturing polyurethane foam | Sadao Kumasaka, Satomi Tada, Osamu Fujii, Shigeo Kuga | 1992-01-07 |
| 4988271 | Apparatus for producing polyurethane foam | Sadao Kumasaka, Satomi Tada, Osamu Fujii, Tutomu Yamamoto, Ryoji Nagamine +4 more | 1991-01-29 |
| 4810298 | Manufacturing method of asphalt foam | Sadao Kumasaka | 1989-03-07 |
| 4610922 | Asphalt impregnated foam and method of producing the same | Sadao Kumasaka, Satomi Tada, Ryoji Nagamine, Hiroshi Taniguchi | 1986-09-09 |