Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4867555 | Retrofocus lens for overhead projector | — | 1989-09-19 |
| 4800868 | Tilted panel linear echelon solar collector | Roger H. Appeldorn | 1989-01-31 |
DV
Dennis F. Vanderwerf
Overall (1989): #29,082 of 140,708Top 25%
2
Patents 1989