Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4864390 | Display system with equal path lengths | Thomas Stewart McKechnie, Joshua D. Eskin, Jeffrey A. Shimizu, Ralph H. Bradley, William F. Guerinot | 1989-09-05 |
| 4824227 | Optimum riser angle for fresnel lenses in projection screens | T. Stewart McKechnie | 1989-04-25 |