Kabushiki Kaisha Gakushu Kenkyusha

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5354224 Block toy including a plurality of blocks that can be variously assembled to create different graphical images and including apertured blocks having engagement surfaces which extend from edges of the apertures into the blocksExpiredJan 11, 93Oct 11, 94[A63H]
D334728 Portable planter for growing small plantsExpiredJun 14, 90Apr 13, 93[]
5190287 Jigsaw puzzle toy using blocksExpiredNov 27, 91Mar 02, 93[A63F]
D329886 Air cushion boat toyExpiredJul 09, 90Sep 29, 92[]
5045013 Air-cushion vehicle toyExpiredJul 17, 90Sep 03, 91[A63H]
4735413 Tennis practice apparatusExpiredAug 28, 85Apr 05, 88[A63B]
4674433 Correct answer displaying device for arithmetic practicing unitExpiredSep 30, 85Jun 23, 87[G09B]
4671779 Running toyExpiredSep 05, 85Jun 09, 87[A63H]
4667962 Children's block toyExpiredNov 04, 85May 26, 87[A63H, A63F]
4636050 Reflection type overhead projectorExpiredDec 20, 84Jan 13, 87[G03B]
4561184 School utensil and toy robotExpiredSep 08, 83Dec 31, 85[A63H, B43K, B43L]

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