A heat spreading apparatus includes a first planar body for attachment to a heat generating surface which results in a hot region and a cool region on the first planar body. A second planar body connected to the first planar body is used to define a void between the first planar body and the second...http://www.google.se/patents/US6167948?utm_source=gb-gplus-sharePatent US6167948 - Thin, planar heat spreader
