Coded playing cards and other standardized documents

Details Coded playing cards and other standardized documents Coded playing cards and other standardized documents

A - Human Necessities

63

F

A63F 1/02 (2006.01) A63F 9/06 (2006.01) A63F 9/24 (2006.01)

Patent

CA 2124201

2124201 9310870 PCTABS00022 An apparently conventional playing card (10) is invisibly coded so that it can only be read face down, by an electro-optic reading means. The card may be of non-laminated conventional card stock which has a substantially white surface conventionally printed with the identification of the suit and value of the card with inks chosen because they are visible but substantially transparent to wavelengths outside the visible range. The face of the card is coded with indicia inklessly marked across its surface with a compound which absorbs wavelengths (outside the visible range) which wavelengths are used by the reading means to read the indicia. The indicia, invisible to the human eye, correspond to a code (11) which uniquely identifies the card. The card may be laminated from top and base sheets and the code concealed behind the front printed face of the top sheet.

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