Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5453013 | Interactive audio visual work | Zeb Billings, Harold D. Pierce | 1995-09-26 |
| D349923 | Electronic book | Zeb Billings, Harold D. Pierce | 1994-08-23 |
| 5209665 | Interactive audio visual work | Zeb Billings, Harold D. Pierce | 1993-05-11 |