Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4856754 | Concrete form shuttering having double woven fabric covering | Takayoshi Yokota, Sadao Uno, Kozo Katayama, Daijiro Tanabe | 1989-08-15 |
| 4848973 | Grout material and grouting method using same | Takayoshi Yokota, Kenji Kita | 1989-07-18 |