Education and demonstration – Audio recording and visual means – Visual information in book form
Reexamination Certificate
2007-04-10
2007-04-10
Cheng, Jor H. (Department: 3714)
Education and demonstration
Audio recording and visual means
Visual information in book form
C434S169000, C434S362000, C345S173000
Reexamination Certificate
active
10448582
ABSTRACT:
An electronic learning/teaching device operates with and without a printed sheet element having an arrangement of selectable content by means of a user responsive sensor array beneath a surface configured to receive the element. The sensor array is formed by cross-points of two sets of crossing conductive lines, one set being driven sequentially with a radio frequency square wave and the other set being sampled sequentially though a high impedance amplifier connection with an asynchronous detection circuit. Where more than one cross-point location is user activated, algorithms are used to identify one cross-point sensor location as the user activated selection.
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Bishop, Jr. James A.
Ernst Stephen M.
Galarneau Dagan
Hoppy Joseph E.
Meade James P.
Akin Gump Strauss Hauer & Feld & LLP
Cheng Jor H.
Mattel Inc.
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