Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5364458 | Adjustable air filtering device | Robert Holland | 1994-11-15 |
| 5266090 | Multi-sided air filter with wraparound filter media | — | 1993-11-30 |
| 4902306 | Dual-dipole electrostatic air filter | Paul David Jackson | 1990-02-20 |
| 4749390 | Four-sided air filter | Paul David Jackson | 1988-06-07 |