Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6802315 | Vapor deposition treated electret filter media | Wai Ming Choi | 2004-10-12 |
| 6780226 | Charge stabilized electret filter media | Norman Lifshutz, Graham C. Stevens | 2004-08-24 |