Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5674076 | Hand-held sound generating device | Michael Hennig, Ralph Dyck, Marc Jorgenson | 1997-10-07 |
| 5551905 | Successive image display device | Michael L. Henning | 1996-09-03 |
| 5453013 | Interactive audio visual work | Harold D. Pierce, Martin R. J. Moore, Sr. | 1995-09-26 |
| D361597 | Interactive audiovisual board | Deborah J. Billings | 1995-08-22 |
| 5404444 | Interactive audiovisual apparatus | — | 1995-04-04 |
| D349923 | Electronic book | Harold D. Pierce, Martin R. J. Moore, Sr. | 1994-08-23 |
| 5331212 | Electrical device with alternative battery power supplies | Mark B. Johnson-Williams | 1994-07-19 |
| 5248843 | Electronic musical instrument with sound-control panel and keyboard | — | 1993-09-28 |
| 5209665 | Interactive audio visual work | Harold D. Pierce, Martin R. J. Moore, Sr. | 1993-05-11 |
| 5087043 | Interactive audio-visual puzzle | Harold D. Pierce, Conrad W. Kish, Patrick E. Kusina | 1992-02-11 |
| D322640 | Toy piano | — | 1991-12-24 |
| D264786 | Literature holder | Chuck Faas | 1982-06-08 |