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| US4003144 | 11 Jul 1975 | 18 Jan 1977 | Damon Corporation | Educational block with replaceable chip |
| US4778392 | 26 Sep 1986 | 18 Oct 1988 | | Educational block set |
| US5035666 | 22 Nov 1989 | 30 Jul 1991 | Dae Kyo Limited | Blocks with platform, wheel and recesses |
| US6327995 | 5 Mar 1999 | 11 Dec 2001 | Protocol Office Products, LLC. | Signalling method and apparatus |
| US6733421 | 24 Sep 1999 | 11 May 2004 | | Hand rehabilitation device and method for the use thereof |
| USD437366 | 29 Jun 2000 | 6 Feb 2001 | | Interlocking building cube |
| USD464682 | 2 Aug 2001 | 22 Oct 2002 | | Building block |
| USD478621 | 25 Sep 2002 | 19 Aug 2003 | Xerox Corporation | Color ink stick for solid ink printer |
| USD480437 | 5 Feb 2003 | 7 Oct 2003 | Classroom Safe-T Products, Inc. | Toy block |
| USD481757 | 25 Sep 2002 | 4 Nov 2003 | Xerox Corporation | Color ink stick for solid ink printer |
| USD481759 | 25 Sep 2002 | 4 Nov 2003 | Xerox Corporation | Color ink stick for solid ink printer |
| USD482063 | 25 Sep 2002 | 11 Nov 2003 | Xerox Corporation | Color ink stick for solid ink printer |
| USD482388 | 25 Sep 2002 | 18 Nov 2003 | Xerox Corporation | Color ink stick for solid ink printer |
| USD482720 | 25 Sep 2002 | 25 Nov 2003 | Xerox Corporation | Color ink stick for solid ink printer |
| USD483404 | 25 Sep 2002 | 9 Dec 2003 | Xerox Corporation | Color ink stick for solid ink printer |
| USD490483 | 18 Apr 2003 | 25 May 2004 | Wesco Company S.A. | Cube |
| USD490484 | 18 Apr 2003 | 25 May 2004 | Wesco Company S.A. | Half cube |
| USD505164 | 29 Jan 2003 | 17 May 2005 | | Set of triangular prismatic blocks having indicia on two faces |
