Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4451068 | Engraved image identification card with opaque cover layer | John S. Hall | 1984-05-29 |
| 4420174 | Identification card bearing latent image perceptible in the presence of background light | John S. Hall | 1983-12-13 |
| 4415612 | Double engraved identification card | John S. Hall | 1983-11-15 |