Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4830642 | Filter system with in situ cleaning of an operating filter unit | Thomas Pfenning | 1989-05-16 |
| 4716738 | Apparatus and method for delivering cryogenic liquid from a supply vessel to receiver vessels | Thomas Pfenning | 1988-01-05 |