Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4703940 | Joint sleeve for pipe with contoured inner surface | — | 1987-11-03 |
| 4557788 | Filament winding of plastic articles | Ralph Friedrich, John D. McKenney | 1985-12-10 |
| 4384913 | Mandrel for filament winding of plastic articles | Ralph Friedrich, John D. McKenney | 1983-05-24 |
| 4323408 | Filament winding of plastic articles | Ralph Friedrich, John D. McKenney | 1982-04-06 |