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| US5005737 | 29 Jun 1989 | 9 Apr 1991 | Seaquist Closures | Flexible dispensing closure having a slitted resilient outlet valve and a flanged vent valve |
| US5115950 | 14 Jan 1991 | 26 May 1992 | Seaquist Closures a divison of Pittway Corporation | Dispensing closure with unitary structure for retaining a pressure-actuated flexible valve |
| US5531363 | 10 Jun 1994 | 2 Jul 1996 | Aptargroup, Inc. | Dispensing closure cartridge valve system |
| US5924605 | 1 Jul 1997 | 20 Jul 1999 | L'Oreal | Dispensing head for a product of liquid to viscous consistency, comprising an elastic closing element and a dispensing unit thus equipped |
| US6095381 | 16 Apr 1998 | 1 Aug 2000 | Zeller Plastik GmbH | Self-closing seal with a sealing membrane |
| US6213355 | 9 Jun 1999 | 10 Apr 2001 | Zeller Plastik GmbH | Closure membrane and closure employing same |
| US6367668 | 10 Feb 2000 | 9 Apr 2002 | Crown Cork & Seal Technologies Corporation | Self-closing closure and closure membrane relating to same |
| US7077296 | 26 Jun 2002 | 18 Jul 2006 | AptarGroup, Inc. | Dispensing valve |
