Issued Patents 2011
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8069880 | Pressure cast concrete or mortar lined steel pipes and methods of making the same | Ralph Friedrich, Qizhong Sheng | 2011-12-06 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8069880 | Pressure cast concrete or mortar lined steel pipes and methods of making the same | Ralph Friedrich, Qizhong Sheng | 2011-12-06 |