Teaching or amusement apparatus

Details Teaching or amusement apparatus Teaching or amusement apparatus

1985-10-31

1986-12-09

Picard, Leo P.

Education and demonstration

Question or problem eliciting response

Correctness of response indicated to examine by...

235462, 235468, 235489, 235494, 382 12, 283 93, 283 94, 283 88, 283901, G09B 506

Patent

active

046278192

ABSTRACT:
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 be detected by an infrared emitter and detector.

REFERENCES:
patent: 4538059 (1985-08-01), Rudland
patent: 4544836 (1985-10-01), Galvin et al.

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