Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4915544 | Method of making cast-in-place prestressing concrete pile by means of movable casing set | — | 1990-04-10 |
| 4842447 | Manufacturing method and device of hollow-typed reverse circulating piles | — | 1989-06-27 |
| 4657440 | Fender | — | 1987-04-14 |
| 4588327 | Precast concrete pile and method of placing it in the ground | — | 1986-05-13 |