Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4867203 | A method of relining or preparing sewage pipe using a plastic pipe comprising an outer corrugated pipe and a smooth inner wall | — | 1989-09-19 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4867203 | A method of relining or preparing sewage pipe using a plastic pipe comprising an outer corrugated pipe and a smooth inner wall | — | 1989-09-19 |