Issued Patents 1982
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4329193 | Method of making a coupling for rigid pressure pipe | John L. Sznopek, Charles Lostak, Joseph P. Ferraro, Henry J. Kazienko | 1982-05-11 |
| 4319950 | Mandrel for making a coupling for rigid pressure pipe | John L. Sznopek, Charles Lostak, Joseph P. Ferraro, Henry J. Kazienko | 1982-03-16 |
| 4315630 | Sealing ring for spigot and socket pipe joint | David W. French, Antonio Maldarella, Jr., Gilbert W. VanHoy | 1982-02-16 |