Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
July 24, 2012
Patent Application Number
11543281
Date Filed
September 28, 2006
Patent Citations Received
Patent Primary Examiner
Patent abstract
A method and apparatus for fireproofing a doorway, more particularly, the present invention relates to a gasket structure capable of sealing a doorway in the event of a fire. The gasket structure includes an outer silicon rubber core having a substantially D-shaped cross-section for mounting to a gasket retainer with a substantially U-shaped channel to a door frame. The gasket also includes an inner core of intumescent material within the outer core. The gasket is designed so that if the outer silicone rubber deteriorates because of fire, the intumescent material undergoes voluminous expansion to fill up voids left by the deterioration of the outer silicone rubber.
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