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| US4453849 | 18 Jun 1982 | 12 Jun 1984 | | Protective shield for a felt tip pen |
| US5300538 | 2 Jun 1992 | 5 Abr 1994 | The Gillette Company | Solid marking compositions |
| US5897264 | 16 Ene 1997 | 27 Abr 1999 | Sanford Corporation | Off-center point marker tip |
| US6382861 | 11 Ago 2000 | 7 May 2002 | Winbond Electronics Corp. | Cleaning device for cleaning dirt produced from manufacturing equipment |
