Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4648224 | Tendon for prestressed concrete | Hiroshi Tada, Keizo Ishikawa | 1987-03-10 |
| 4577443 | Metallic sheath for posttensioning method | Wataru Abe, Tadaaki Takase | 1986-03-25 |
| 4557087 | Metallic sheath for a posttensioning method provided with rust proofing treatment | Wataru Abe | 1985-12-10 |