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Philip G Martin, Jianxian Xue: Filtering face mask that has a resilient seal surface in its exhalation valve. 3M Innovative Properties Company, Karl G Hanson, March 13, 2007: US07188622 (35 worldwide citation)

A filtering face mask 10 that has a mask body and a new exhalation valve 14. The mask body is adapted to fit at least over the nose and mouth of a person to help define an interior gas space when the mask is worn. The exhalation valve 14 permits fluid communication between the interior gas space and ...


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Philip G Martin, Jianxian Xue: Filtering face mask that uses an exhalation valve that has a multi-layered flexible flap. 3M Innovative Properties Company, Karl G Hanson, April 18, 2006: US07028689 (23 worldwide citation)

A filtering face mask that includes a mask body and an exhalation valve. The mask body is adapted to fit at least over the nose and mouth of a wearer to create an interior gas space when worn, and the exhalation valve is in fluid communication with the interior gas space. The exhalation valve compri ...


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Philip G Martin, Jianxian Xue: Exhalation and inhalation valves that have a multi-layered flexible flap. 3M Innovative Properties Company, Karl G Hanson, March 21, 2006: US07013895 (20 worldwide citation)

Exhalation and inhalation valves that are sized and adapted to fit on a mask body of a personal respiratory protection device. The exhalation and inhalation valves comprise a valve seat that has a seal surface and an orifice through which an exhale flow stream may pass to leave the interior gas spac ...


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Philip G Martin, Jianxian Xue: Filtering face mask that has a resilient seal surface in its exhalation valve. 3M Innovative Properties Company, December 23, 2004: US20040255947-A1

A filtering face mask 10 that has a mask body and a new exhalation valve 14. The mask body is adapted to fit at least over the nose and mouth of a person to help define an interior gas space when the mask is worn. The exhalation valve 14 permits fluid communication between the interior gas space and ...


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Philip G Martin, Jianxian Xue: Filtering face mask that uses an exhalation valve that has a multi-layered flexible flap. 3m Innovative Properties Company, March 24, 2005: US20050061327-A1

A filtering face mask that includes a mask body and an exhalation valve. The mask body is adapted to fit at least over the nose and mouth of a wearer to create an interior gas space when worn, and the exhalation valve is in fluid communication with the interior gas space. The exhalation valve compri ...


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Philip G Martin, Jianxian Xue: Exhalation and inhalation valves that have a multi-layered flexible flap. 3M Innovative Properties Company, 3m Innovative Properties Company, July 21, 2005: US20050155607-A1

Exhalation and inhalation valves that are sized and adapted to fit on a mask body of a personal respiratory protection device. The exhalation and inhalation valves comprise a valve seat that has a seal surface and an orifice through which an exhale flow stream may pass to leave the interior gas spac ...