Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
April 9, 2013
Patent Application Number
12237620
Date Filed
September 25, 2008
Patent Citations Received
Patent Primary Examiner
Patent abstract
Methods and systems are provided for reducing hydrocarbon emissions from an engine having a hydrocarbon retaining system. One example method comprises flowing exhaust gas over a hydrocarbon trap, the trap having a plurality of layers with different porosity and/or a different adsorptive affinity to hydrocarbon chains, and flowing hydrocarbons from a fuel tank over the hydrocarbon trap.
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