Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5460416 | Perforated fiber reinforced pipe and couplings for articulating movement | Ralph S. Freidrich, Ronald Douglas Johnson, Robert E. Hamilton | 1995-10-24 |
| 4601496 | Fiber reinforced plastic pipe tee | Ralph Friedrich | 1986-07-22 |
| 4601770 | Fiber reinforced plastic pipe tee | Ralph Friedrich | 1986-07-22 |