CODED PLAYING CARDS AND OTHER STANDARDIZED DOCUMENTS

Title:

CODED PLAYING CARDS AND OTHER STANDARDIZED DOCUMENTS

Document Type and Number:

WIPO Patent Application WO/1993/010870

Kind Code:

A1

Abstract:

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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Inventors:

SOULES JACK A (US)
CARPENTER BRYAN A (US)

Application Number:

PCT/US1992/009704

Publication Date:

June 10, 1993

Filing Date:

November 18, 1992

Export Citation:

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Assignee:

TECH SYSTEMS CORP (US)

International Classes:

A63F1/02; A63F1/14; G06K19/00; A63F9/06; A63F9/24; (IPC1-7): A63F1/02

Foreign References:

US3640009A	1972-02-08
US4534562A	1985-08-13
US4662637A	1987-05-05
US4889367A	1989-12-26

Other References: