|
| US4003144 | 11 Jul 1975 | 18 Jan 1977 | Damon Corporation | Educational block with replaceable chip |
| US4294469 | 6 Aug 1979 | 13 Oct 1981 | | Book binders and books made with said binders |
| US4315642 | 6 Aug 1979 | 16 Feb 1982 | | Integrally molded covers and spines for looseleaf books |
| US4427390 | 26 Oct 1981 | 24 Jan 1984 | | Educational book-like toy |
| US5542849 | 18 Jan 1995 | 6 Aug 1996 | | System for self-typing of individual essences |
| US5653471 | 4 Jun 1996 | 5 Aug 1997 | R.R. Donnelley & Sons Company | Nested book assembly |
| US5683112 | 2 Apr 1996 | 4 Nov 1997 | R. R. Donnelley & Sons Company | Puzzle book |
| US5810536 | 14 Jul 1997 | 22 Sep 1998 | R.R. Donnelley & Sons Company | Method of forming a puzzle book |
| US5857706 | 25 Sep 1997 | 12 Jan 1999 | R. R. Donnelley & Sons Company | Puzzle book |
| US6227863 | 18 Feb 1998 | 8 May 2001 | | Phonics training computer system for teaching spelling and reading |
| US6702586 | 6 Dec 2002 | 9 Mar 2004 | Sharmac Designs LLC | Teaching puzzle |
| US7140643 | 28 May 2004 | 28 Nov 2006 | | Apparatus and method for teaching early learning skills |
| US8202094 | 5 Nov 2004 | 19 Jun 2012 | Radmila Solutions, L.L.C. | System and method for training users with audible answers to spoken questions |
| USD425117 | 29 Jul 1998 | 16 May 2000 | Toyo Co., Ltd. | Sheet for use in making solid objects |
