1
Desmond T Curran, Peter D Lee, Richard D Williams, Peter N Yates, Derek S Baker: Supplied air helmet having face seal with differentiated permeability. 3M Innovative Properties Company, Karl G Hanson, April 3, 2007: US07197774 (15 worldwide citation)

A supplied air helmet 10 comprises a visor 14 and a face seal 12 that is secured to the visor. The face seal 12 includes a sealing member 18 and a frame member 16. The sealing member 18 extends radially inward from the frame member 16 and has first and second regions of permeability 20 and 22. The s ...


2
Desmond T Curran, Peter D Lee, Richard D Williams, Peter N Yates: Supplied air helmet having a knitted face seal. 3m Innovative Properties Company, May 25, 2006: US20060107431-A1

A supplied air helmet 10 that has a visor 14 and a face seal 16. The face seal 16 is secured to the visor 14 and includes a sealing member 18 that comprises a knitted fabric. The knitted fabric is disposed on the face seal 16 in a location where the face seal 16 makes contact with a wearer's face. T ...


3
Desmond T Curran, Peter D Lee, Richard D Williams, Peter N Yates, Derek S Baker: Supplied air helmet having face seal with differentiated permeability. 3m Innovative Properties Company, May 18, 2006: US20060101555-A1

A supplied air helmet 10 comprises a visor 14 and a face seal 12 that is secured to the visor. The face seal 12 includes a sealing member 18 and a frame member 16. The sealing member 18 extends radially inward from the frame member 16 and has first and second regions of permeability 20 and 22. The s ...