I'm glad many of you are having some laughs over what I wrote. It leads me to think you did not understand my point. Part of the reason inflatable seat belts did not come into use on new cars is the that makers of conventional air bags and seat belts safety systems such as Autoliv were so well entrenched with the automobile makers and automobile seat manufacturers that the makers of inflatable seat belts thought they had to work with these to gain entrance. Why would Autoliv want to replace up to 8 air bags (2 front, 2 side front, 2 rear side, 2 side curtain) and at least 2 front seat belts and their associated pyrotechnic pre-tensioners with only 4 inflatable seat belts with only 4 pyrotechnic inflators, which would cost less and make them less revenue? Here's a link to a bunch of patents on inflatable seat belts. The key advantages are that they work differently than conventional air bags, primarily in that they inflate away from your body rather than toward it, and the inflation cycle automatically removes the slack in the belt and helps position the person's body to better survive the crash impact.
http://www.google.com/patents?as_dr...007&as_maxm_ap=1&as_maxy_ap=2007&q=inflatable+seat+belt+%22inflatable+seat+belt%22&lr=&sa=N&start=10
Dave R.