Issued Patents 2003
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D481071 | Interactive quiz machine with cartridge in an open position | Matthew W. Jeffirs, Roger K. Nix | 2003-10-21 |
| D480108 | Interactive quiz cartridge | Matthew W. Jeffirs, Roger K. Nix | 2003-09-30 |
| D480109 | Interactive quiz machine with cartridge | Matthew W. Jeffirs, Roger K. Nix | 2003-09-30 |
| D478126 | Interactive quiz machine | Matthew W. Jeffirs, Roger K. Nix | 2003-08-05 |