Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6067192 | Portable viewing apparatus having multiple interchargeable optical modules | Louis Lichtenfield | 2000-05-23 |
| 5126878 | Portable stereoscopic viewing apparatus | Louis Lichtenfield | 1992-06-30 |
| 5124840 | Portable viewing apparatus | Louis Lichtenfield | 1992-06-23 |