Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4329193 | Method of making a coupling for rigid pressure pipe | John L. Sznopek, Charles Lostak, Robert W. Heisler, Henry J. Kazienko | 1982-05-11 |
| 4319950 | Mandrel for making a coupling for rigid pressure pipe | John L. Sznopek, Charles Lostak, Robert W. Heisler, Henry J. Kazienko | 1982-03-16 |