Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4270878 | Corrugated drainage tubing and method and apparatus for making drainage tubing with helically arranged drainage openings | — | 1981-06-02 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4270878 | Corrugated drainage tubing and method and apparatus for making drainage tubing with helically arranged drainage openings | — | 1981-06-02 |