Patent ID: 8608193

Claim:
Apparatus for helping to protect an occupant of a vehicle that has a side structure and a roof, the apparatus comprising: an inflatable vehicle occupant protection device that is inflatable away from the vehicle roof into a position between the side structure of the vehicle and a vehicle occupant, the inflatable vehicle occupant protection device comprising an inflatable main portion having at least one inflatable primary chamber and an inflatable secondary chamber, each primary chamber having an inflation fluid inlet and a plurality of inflation fluid outlets; and an inflation fluid source that is actuatable to provide inflation fluid for inflating the inflatable vehicle occupant protection device, the inflation fluid source, when actuated, directing inflation fluid into the main portion to inflate the main portion, the inflation fluid inlet of each primary chamber directing inflation fluid from the inflation fluid source into the primary chamber, the inflation fluid outlets of each primary chamber directing inflation fluid from the primary chamber into the secondary chamber to inflate the secondary chamber.