Patent ID: 8297262

Claim:
A fuel vapor storage and recovery apparatus including a fuel vapor storage canister, said fuel vapor storage canister comprising; a plurality of vapor storage compartments, wherein the plurality of vapor storage compartments provide all the vapor storage compartments of the apparatus; the plurality of vapor storage compartments comprising first and second vapor storage compartments, said first and second vapor storage compartments filled with an absorbent material to form a vapor storage bed; at least one vapor inlet port connected to a fuel tank; an atmospheric vent port and a purge port; said fuel vapor storage canister defining an air flow path between said at least one vapor inlet port and said atmospheric vent port and between said atmospheric vent port and said purge port; said first storage compartment being closer in proximity to the vapor inlet port than said second storage compartment and the first compartment to receive vapor from said fuel tank; wherein said first and second vapor storage compartments in flow direction are separated from each other by an air gap diffusion barrier; and wherein all the vapor storage compartments of the apparatus are arranged in concentric relationship to each other.