1
James C Wingo Jr, Nelson Kraemer: Protective helmet and liner. Riddell, Ben D Tobor, July 30, 1991: US05035009 (108 worldwide citation)

A protective helmet and liner therefor includes a sheet of sound deadening material which fits between impact force absorbing pad structures disposed on the interior of the protective helmet.


2
Emerson Spalding Phipps, Charles Edward Phipps: Protective helmet. Locke Lord, January 24, 2017: US09549582 (5 worldwide citation)

A protective member such as a helmet includes an outer layer and an inner layer interconnected by multiple connectors, such as extension springs, under tension along their longitudinal axis. The connectors absorb energy from an impact force by resisting further tension along their longitudinal axis ...


3
Emerson Spalding Phipps, Charles Edward Phipps: Protective member. Locke Lord, January 30, 2018: US09879741

A protective member includes outer and inner layers interconnected by multiple connectors under tension along their longitudinal axis. The connectors absorb energy from an impact force by resisting further tension along their longitudinal axis, can elongate along their longitudinal axis and allow th ...


4
Protective Helmet. February 23, 2017: US20170050593-A1

A protective member such as a helmet includes an outer layer and an inner layer interconnected by multiple connectors, such as extension springs, under tension along their longitudinal axis. The connectors absorb energy from an impact force by resisting further tension along their longitudinal axis ...