An inflator for inflating an airbag has a housing with a first housing portion defining a first chamber and a second housing portion defining a second chamber. A gas generant disposed in the first and second chambers. A barrier separates the first and second chambers. Each of the chambers has an ignition...http://www.google.fr/patents/US6886856?utm_source=gb-gplus-shareBrevet US6886856 - Dual stage inflator
