Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5060696 | Plastic pipe comprising an outer corrugated pipe and a smooth inner wall | — | 1991-10-29 |
| 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 |