Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5417522 | Soil fragmentation members and multiple lateral support structures for improved soil mixing and efficient boring for use on multi-shaft auger soil mixing apparatus | David Yang | 1995-05-23 |
| 5378085 | Methods for in situ construction of deep soil-cement structures | David Yang | 1995-01-03 |
| 5368415 | Spiral flights for improved soil mixing and efficient boring for use on multi-shaft auger soil mixing apparatus | David Yang | 1994-11-29 |