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Patents

Referenced by

Citing PatentFiling dateIssue dateOriginal AssigneeTitle
US421815426 Jun 197819 Aug 1980Writing instrument with self-closure
US454429730 Dec 19831 Oct 1985S. T. DupontBall point pen venting
US47596509 Feb 198726 Jul 1988Dennison Manufacturing CompanyRetractable marking pen with tip protection mechanism
US491157028 Mar 198827 Mar 1990Enclosure means for liquid applicators
US502277330 Mar 199011 Jun 1991Retractable pen with self sealing writing tip opening
US603314127 Sep 19967 Mar 2000Nottingham-Spirk Design Associates, Inc.Capless retractable sealed marking instruments
US62136613 Sep 199810 Apr 2001Retractable felt-tipped pen
US705979617 Apr 200313 Jun 2006Avery Dennison CorporationSelf-sealing retractable writing instrument
US74881301 Feb 200710 Feb 2009Sanford, L.P.Seal assembly for retractable instrument
US77757349 Feb 200917 Aug 2010Sanford L.P.Seal assembly for retractable instrument
US785038218 Jan 200714 Dec 2010Sanford, L.P.Valve made from two materials and writing utensil with retractable tip incorporating same
US817744726 Apr 200715 May 2012Morris CorporationSlide type writing tools having device for prevent dryness
US82210127 Nov 200817 Jul 2012Sanford, L.P.Retractable instruments comprising a one-piece valve door actuating assembly
US822631228 Mar 200824 Jul 2012Sanford, L.P.Valve door having a force directing component and retractable instruments comprising same

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