Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4997344 | Rotor bearing pre-load for a radial piston pump | Roger J. Nelson, Donald J. MacDonald, Arlen W. Koelling | 1991-03-05 |
| 4915595 | Valve/piston cartridge and rotor bearing pre-load for a radial piston pump | Roger J. Nelson, Donald J. MacDonald, Arlen W. Koelling | 1990-04-10 |