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Filter and method of forming

  • US 5,372,380 A
  • Filed: 05/20/1993
  • Issued: 12/13/1994
  • Est. Priority Date: 05/20/1993
  • Status: Expired due to Term
First Claim
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1. An air bag assembly comprising a propellant gas generator, an igniter for said propellant gas generator, an airbag, and a filter member between said propellant gas generator and said airbag, said filter member comprising a rigid porous composite having a pyrolyzed carbon substrate and a thermally and structurally stable coating, said filter member having the unaided structural strength and toughness to withstand an instantaneous pressure pulse of at least approximately 4,000 pounds per square inch and an instantaneous temperature pulse of at least approximately 2,700 degrees Fahrenheit, whereby propellant gas is dispensed substantially uniformly from said filter member.

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