Issued Patents 2002
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6398920 | Partially ionized plasma mass filter | Tihiro Ohkawa, Sergei Putvinski, Richard L. Freeman | 2002-06-04 |
| 6386374 | Multi-mass filter with electric field variations | Tihiro Ohkawa, Richard L. Freeman | 2002-05-14 |
| 6356025 | Shielded rf antenna | Richard L. Freeman | 2002-03-12 |