05014365 is referenced by 74 patents and cites 29 patents.

A protective helmet employs an inflatable bladder on the interior of the helmet. The inflatable bladder has cells that extend to the lower rear octants of the wearers head and also to either the crown or upper front octants of the wearers head. The cells are inflatable through a single valve and properly secure the helmet to the wearers head during use. In the preferred embodiment, the helmet is fully lined with resilient material interposed between the bladder and the wearer's head.

Title
Gas-fitted protective helmet
Application Number
7/300329
Publication Number
5014365
Application Date
January 23, 1989
Publication Date
May 14, 1991
Inventor
Arthur M Schulz
Roselle
IL, US
Agent
Neuman Williams Anderson & Olson
Assignee
Maxpro Helmets
IL, US
IPC
A63B 71/16
A42B 3/02
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