Referenced by|
| US4067580 | May 26, 1976 | Jan 10, 1978 | | Mystic numbered geometrics | | US4258479 | Feb 12, 1979 | Mar 31, 1981 | | Tetrahedron blocks capable of assembly into cubes and pyramids | | US4421311 | Jan 29, 1982 | Dec 20, 1983 | Ideal Toy Corporation | Puzzle-cube | | US4461480 | Sep 30, 1982 | Jul 24, 1984 | | Educational entertainment device comprising cubes formed of four 1/8th octahedron sections rotatably coupled to a tetrahedron | | US4513970 | Jan 24, 1983 | Apr 30, 1985 | | Polymorphic twist puzzle | | US4558866 | Aug 14, 1981 | Dec 17, 1985 | | Regular polyhedron-based logical puzzles | | US4593907 | Jul 2, 1982 | Jun 10, 1986 | | Polyhedral and sperical cubic puzzles | | US4605231 | Sep 19, 1984 | Aug 12, 1986 | | Light transmission puzzle game | | US4852878 | Dec 9, 1987 | Aug 1, 1989 | | Toy blocks for multiple puzzles and games of varying skill levels | | US4872682 | Nov 17, 1987 | Oct 10, 1989 | | Cube puzzle with moving faces | | US4886273 | Oct 3, 1988 | Dec 12, 1989 | | Toy and puzzle with reversible breakability | | US5192077 | Jun 26, 1992 | Mar 9, 1993 | Sylvia Caicedo | Fraction illustrating polyhedron | | US5242166 | Jun 23, 1992 | Sep 7, 1993 | | Device for intellectual exercise | | US5318302 | Jan 26, 1993 | Jun 7, 1994 | | Magnetic puzzle | | US5407201 | Mar 23, 1993 | Apr 18, 1995 | | Educational puzzle and method of construction | | US5409236 | Dec 23, 1993 | Apr 25, 1995 | | Magnetic game or puzzle and method for making same | | US5620325 | Aug 10, 1995 | Apr 15, 1997 | | Educational blocks with enhanced manipulation features | | US5947786 | Apr 11, 1997 | Sep 7, 1999 | | Educational blocks with enhanced manipulation features | | US6158740 | Oct 26, 1998 | Dec 12, 2000 | | Cubicle puzzle game | | US6241249 | Jul 21, 1999 | Jun 5, 2001 | | Puzzle block | | US6257574 | Aug 5, 1999 | Jul 10, 2001 | | Multi-polyhedral puzzles | | US6857632 | Oct 7, 2002 | Feb 22, 2005 | | Puzzles | | US6869073 | Jan 26, 2004 | Mar 22, 2005 | | Vertical board game and apparatus therefor | | US7234986 | Oct 15, 2004 | Jun 26, 2007 | Mega Brands America, Inc. | Magnetic construction kit with wheel-like components | | US7255624 | Oct 14, 2005 | Aug 14, 2007 | MEGA Brands America, Inc. | Illuminated, three-dimensional modules for a magnetic toy construction kit | | US7273404 | Oct 15, 2004 | Sep 25, 2007 | MEGA Brands America, Inc. | Magnetic construction modules for creating three-dimensional assemblies | | US7322873 | Oct 18, 2005 | Jan 29, 2008 | MEGA Brands America, Inc. | Illuminated, three-dimensional modules with coaxial magnetic connectors for a toy construction kit | | US7785179 | Mar 15, 2003 | Aug 31, 2010 | | Mechanical and electronic combinatory game and puzzle | | US7887056 | Sep 20, 2007 | Feb 15, 2011 | Educocio S.L. | Puzzle formed by a plurality of cubes | | US7942718 | Sep 20, 2007 | May 17, 2011 | Educocio S.B. | Didactic game piece | | US7976024 | Jan 14, 2009 | Jul 12, 2011 | | Tessellating pattern cubes | | US8061713 | Jan 29, 2007 | Nov 22, 2011 | TBL Sustainability Group Inc. | Three dimensional geometric puzzle |
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