Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5295809 | Valved piston pump with cylinder biasing means | Helmut Dresler | 1994-03-22 |
| 4388051 | Piston pump with intake valve | Helmut Dresler | 1983-06-14 |
| 4273028 | Valves and operating system for expansion machines | Stefan Asztalos, Rudolf Rosenmeier | 1981-06-16 |