发明名称 Hidden message greeting card
摘要 A greeting card kit which includes a greeting card containing a "hidden message." The greeting card includes an imprinted crossword puzzle type lattice having open squares and spaced numbers each keyed to either an "across" or a "down" heading. A recipient of the greeting card solves the crossword puzzle using clues and deciphers the hidden message through a mask of the greeting card.
申请公布号 US5815964(A) 申请公布日期 1998.10.06
申请号 US19960708755 申请日期 1996.09.09
申请人 DOUGLAS, ROY S. 发明人 DOUGLAS, ROY S.
分类号 B42D15/02;B42D15/04;(IPC1-7):G09F1/00 主分类号 B42D15/02
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