Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4875259 | Intermeshable article | — | 1989-10-24 |
| 4848319 | Refracting solar energy concentrator and thin flexible Fresnel lens | — | 1989-07-18 |
| 4800868 | Tilted panel linear echelon solar collector | Dennis F. Vanderwerf | 1989-01-31 |