G09B 1/34

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
9443439 Figure plate setFeb 24, 15Sep 13, 16PASCAL CO., LTD.
9443440 Figure plate setMar 13, 15Sep 13, 16PASCAL CO., LTD.
5863204 Apparatus and method for teaching characterOct 16, 97Jan 26, 99Not available
5820381 Teaching apparatus and method for visually representing mathematical expressionsApr 07, 97Oct 13, 98FIRSTBANK PUERTO RICO
5738523 Written composition teaching methods and aids thereforMay 20, 96Apr 14, 98Not available
5645431 Teaching apparatus and method for visually representing mathematical expressionsMar 24, 94Jul 08, 97FIRSTBANK PUERTO RICO
5328373 Method and apparatus for teaching readingMar 30, 93Jul 12, 94Not available
4838794 Metric block toyJun 16, 88Jun 13, 89Not available
4830619 Table setting display guideJan 27, 88May 16, 89ADVANCED MAGAZINE PUBLISHERS INC., The Conde Nast Publications Inc.,
4637799 System and game that stimulates creative and verbal exerciseNov 27, 81Jan 20, 87Not available
4613309 Figures of speechSep 19, 85Sep 23, 86Not available
4478582 Language syntax educational systemSep 30, 82Oct 23, 84Not available
4472146 Learning systemNov 06, 81Sep 18, 84Not available
4315748 Alphabetic deviceMar 22, 79Feb 16, 82THE GOVERNORS OF THE UNIVERSITY OF ALBERTA