1
Chang Lee, Michael C Cordeiro, Andrew F Conn: Protective headgear for whitewater use. Whitewater Research and Safety Institute, Thorpe North & Western, February 15, 2005: US06854133 (34 worldwide citation)

Protective headgear configured for protection of a portion of a wearer's head, including a resilient outer shell, a layered composite liner including a multiplicity of deformable layers, each layer having a different stiffness than adjacent layers, and wherein a layer has a higher stiffness than tha ...


2
Chang Lee, Michael C Cordeiro, Andrew F Conn: Protective headgear for whitewater use. Whitewater Research & Safety Institute, Clifton W Thompson, Thorpe North & Western, December 4, 2003: US20030221245-A1

Protective headgear configured for protection of a portion of a wearer's head, including a resilient outer shell, a layered composite liner including a multiplicity of deformable layers, each layer having a different stiffness than adjacent layers, and wherein a layer has a higher stiffness than tha ...