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| US7850382 | 18 Ene 2007 | 14 Dic 2010 | Sanford, L.P. | Valve made from two materials and writing utensil with retractable tip incorporating same |
| US8221012 | 7 Nov 2008 | 17 Jul 2012 | Sanford, L.P. | Retractable instruments comprising a one-piece valve door actuating assembly |
| US8226312 | 28 Mar 2008 | 24 Jul 2012 | Sanford, L.P. | Valve door having a force directing component and retractable instruments comprising same |
