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| US4823148 | 29 Mar 1988 | 18 Apr 1989 | | Plotter pen with asymmetric point |
| US5143463 | 7 Feb 1992 | 1 Sep 1992 | | Writing aid |
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| US6273626 | 30 Nov 1998 | 14 Aug 2001 | Zebra Co., Ltd. | Grip for a writing instrument |
| US7666201 | 7 Jun 2004 | 23 Feb 2010 | | Spreading instrument |
| US8057499 | 18 Aug 2007 | 15 Nov 2011 | | Ergonomic hand instrument |
| USD307444 | 9 Feb 1987 | 24 Apr 1990 | The Gillette Company | Grip portion for a writing instrument |
| USD325932 | 31 Mar 1989 | 5 May 1992 | | Grip for a writing instrument |
| USD373143 | 27 Sep 1995 | 27 Aug 1996 | Little People Limited | Grip for a writing implement |
