Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885783 | Elastomer membrane enhanced electrostatic transducer | Robert L. Clark, Francis L. Curzon | 1989-12-05 |
| 4883341 | Non-reflective graphic surface | — | 1989-11-28 |
| 4850665 | Method and apparatus for controlled emission of light from prism light guide | — | 1989-07-25 |
| 4834495 | Collapsible light pipe | Jonathan E. Scott, Malcolm Greaves | 1989-05-30 |