Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4511423 | Apparatus for winding fiber reinforced pipe fittings | Ralph Friedrich | 1985-04-16 |
| 4437616 | Winding fiber reinforced pipe fittings | Ralph Friedrich | 1984-03-20 |
| 4308225 | Producing reinforced plastic pipe with a multi-mandrel machine | — | 1981-12-29 |
| 4253894 | Delivering roving for fabrication of plastic pipe | — | 1981-03-03 |
| 4208230 | Impregnating a fibrous web with liquid | — | 1980-06-17 |