A heat sink includes a base plate and a plurality of heat dissipating fins upwardly extending from the base plate. Each fin includes a heat dissipating portion and a connecting portion integrated with the base plate by punching whereby concave sections are left in the connecting portion. The fins can...http://www.google.ca/patents/US20010001898?utm_source=gb-gplus-sharePatent US20010001898 - Heat sink and method for making the same
