Patent ID: 7258081

Claim:
A vaporizer for a fuel processing system comprising: a first tubular portion having a first passageway operable to exchange heat between a fluid in said first passageway and a fluid on an exterior of said first tubular portion, said first tubular portion extending radially inwardly from an outer section of the vaporizer to a central section of the vaporizer; and a second tubular portion having a second passageway in fluid communication with said first passageway and operable to exchange heat between a fluid in said second passageway and a fluid on an exterior of said second tubular portion, said second tubular portion extending radially outwardly from said central section of the vaporizer to said outer section of the vaporizer substantially following a path of said first tubular portion while being spaced apart from said first tubular portion, wherein each of said first and second tubular portions is a flat tubular portion having opposed major surfaces separated by minor side walls.