Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12251655 | Cyclonic air filter assembly for an engine | Robert S. Johnson | 2025-03-18 |
| 11712649 | Cyclonic air filter assembly for an engine | Robert S. Johnson | 2023-08-01 |
| 11260328 | Cyclonic air filter assembly for an engine | Robert S. Johnson | 2022-03-01 |
| D896945 | Air filter | Robert S. Johnson | 2020-09-22 |
| D876600 | Air filter | Robert S. Johnson | 2020-02-25 |
| D867568 | Air filter | Robert S. Johnson | 2019-11-19 |