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| Number | Title | Issue Date |
| 4627819 | Teaching or amusement apparatus A printed substrate has areas printed in a screen of carbon black ink dots and other areas printed in a corresponding screen of infrared transparent ink dots, whereby, the presence of the carbon black ink dots is made visually undetectable but can readily... | 12/09/1986 |
| 4604065 | Teaching or amusement apparatus Teaching or amusement apparatus consists of a substrate bearing printed intelligence and a detector pen or unit for use therewith. The detector pen discriminates between areas on the printed substrate by means not visible to the naked eye e.g. by a differ... | 08/05/1986 |
