Patent ID: 7650928

Claim:
A thermosiphon cooling assembly for cooling an electronic device comprising; a boiler plate presenting an interior surface for transferring heat from the electronic device to a refrigerant, a boiler housing extending from said boiler plate and through a closed cover between spaced ends extending along an axis parallel to said boiler plate to define a boiling chamber over said interior surface of said boiler plate, said cover of said boiler housing defining a plurality of openings, a plurality of hairpin condenser tubes presenting spaced legs extending to distal ends with said legs extending into said openings for collection of refrigerant vapor from said boiler housing, said assembly characterized by said distal ends of said tubes extending into said chamber from said cover the least distance midway between said ends of said boiler housing and increase in distance in opposite directions toward said ends and said hairpin tubes are in groups with each tube in a group having the same length and each group having different lengths with at least one group including more than one tube.