Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12168188 | Quick oil change filter and assembly | Elizabeth Woytach, Randall Ammentorp, Chris Martinek, Rodney Balzar, Glen Stroik | 2024-12-17 |
| D990645 | Oil filter | Elizabeth Woytach, Randall Ammentorp | 2023-06-27 |
| 11571640 | Quick oil change filter and assembly | Elizabeth Woytach, Randall Ammentorp, Chris Martinek, Rodney Balzar, Glen Stroik | 2023-02-07 |
| D920470 | Oil filter | Elizabeth Woytach, Randall Ammentorp | 2021-05-25 |
| 9784151 | Spray cooled oil system for an internal combustion engine | Randy Ammentorp | 2017-10-10 |
| 8579169 | Mounting assembly for a vehicle accessory | Joseph A. Racz | 2013-11-12 |