Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6020882 | Television access control system | John R. Kinghorn | 2000-02-01 |
| 5386238 | Combination TV receiver and teletext processor with on-screen message capability | John R. Kinghorn, Jeremy R. Stevens | 1995-01-31 |
| 5208671 | Teletext decoder arrangement | — | 1993-05-04 |
| 5111462 | Decoders for Hamming encoded data | — | 1992-05-05 |
| 4910595 | Teletext decoders | Richard E. F. Bugg | 1990-03-20 |