Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12129785 | Fan shroud | Seng Chang, Michael Koehler | 2024-10-29 |
| 11286840 | Fan shroud | Seng Chang, Michael Koehler | 2022-03-29 |
| 10512866 | Filter housing for filter fan | Seng Chang, Douglas L. Neuenfeldt, William J. Nepsha, Richard Raisanen, Michael Koehler +3 more | 2019-12-24 |
| D859631 | Fan shroud | Seng Chang, Michael Springstead | 2019-09-10 |
| D851742 | Support for a fan shroud | Seng Chang, Michael Springstead | 2019-06-18 |
| 9714770 | Fresh air cooling device | Michael Rasmussen | 2017-07-25 |