Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6189768 | Process and apparatus for pressing an external sleeve onto a tube for enhancing weld design | Janek Porowski, David L. Lewis, Marvin Skiff | 2001-02-20 |
| 5538261 | Mechanical heat-exchange tube sealing system | Janek Porowski | 1996-07-23 |
| 5375730 | Unloading valve for hopper car | Andrew J. Bahr, Luigi P. Simonelli | 1994-12-27 |