The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 23, 2003
Filed:
Apr. 17, 2002
Varaprasad V. Calmidi, Vestal, NY (US);
Krishna Darbha, Kirkland, WA (US);
Sanjeev B. Sathe, Binghamton, NY (US);
Jamil A. Wakil, Binghamton, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A heat sink structure is formed by stacking a plurality of heat sink layers. Each layer comprises an array of vertically disposed heat dissipating elements extending from a base plate. Cut outs are formed in each of the base plates to form openings so that when the layers are stacked, each of the ascending successive layers has a larger opening than the layer upon which it rests. Cooling may be by forced air or natural convection. With forced air, air impinges on the top of the stack and into the opening in the base plates. Because of diminishing size of the openings in the stack, a portion of the air is forced out the sides of each layer. With natural convection, air is drawn into the sides of each layer and the hot air at the center flows upwardly through the openings with increasing volume as it rises.