Method and apparatus for forming liquid filled heat transfer device

A heat transfer device comprising:

• a first plate having an inner surface and an outer surface;
• a second plate having an inner surface and an outer surface;
• and
• a third plate between the first and second plates, the third plate including first and second sides respectively adjacent the first and second plates;
• wherein the first, second and third plates are sealed together about a closed periphery to define a closed volume between the first and second plates, the closed volume containing a working fluid and including a first section between the inner surface of the first plate and the third plate, and a second section between the inner surface of the second plate and the third plate, the third plate including openings to permit fluid communication for the working fluid between the first and second sections of the closed volume.

A heat transfer device comprising:

• a first plate having an inner surface and an outer surface;
• and
• a second plate having an inner surface, an outer surface and an opening extending from the outer surface to the inner surface;
• wherein the first and second plates are positioned with respective inner surfaces facing each other and are sealed together about a closed periphery that extends around the opening to define a closed volume, the first and second plates being sealingly joined along a first joint that extends chordwise across the closed periphery, the first joint defining with the closed periphery a first portion of the closed volume that includes the opening and a third portion of the closed volume.