Diesel fuel line heater

Claim 1

A heater to be mounted against a cylindrical side of a filter of a diesel fuel line comprising: a. a metal arcuate backing member porportioned to extend around less than one-half of the circumference of the filter for a diesel fuel line and including quarter moon-shaped end closure members secured to the top and bottom ends of said arcuate backing member and forming therewith an inner, arcuate open side which is proportioned to lie against the cylindrical side of the filter. b. a high heat transfer, arcuate metal sheet covering said inner open side, sealed to said end closure members and to the edges of said backing member forming a plenum chamber therewith, and having its inner surface approximately the same arcuate configuration as the filter so that said chamber fits closely to about one-half of the filter circumference and said backing member having a lesser radius of curvature to provide said plenum chamber with a thicker portion in the middle than at the ends; c. an exhaust inlet means mounted in said backing member adjacent one edge and one end thereof, and an exhaust outlet mounted in said backing member adjacent the opposed edge and the opposite end thereof; and d. means for securing said chamber to a filter member in a diesel fuel line.