G09B 1/30

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
9454916 Device for early teaching of mathematicsMay 06, 13Sep 27, 16Not available
9443440 Figure plate setMar 13, 15Sep 13, 16PASCAL CO., LTD.
9266031 Block toy for music educationMar 08, 13Feb 23, 16Human League Co., Ltd.
9174142 Fastening structureMar 18, 11Nov 03, 15LEE, HYUNG-GON
8747311 Method and apparatus for evaluating the effects of internal and external stress influencesNov 18, 10Jun 10, 14Make3Wishes, LLC
5954509 Educational deviceSep 23, 94Sep 21, 99Not available
5306153 Educational device for developing vocabulary and spelling skillsMay 10, 93Apr 26, 94Not available
5271623 Game with matching piecesNov 23, 92Dec 21, 93Not available
4262431 Word building teaching aidFeb 13, 79Apr 21, 81Not available