The present invention is directed to a heat sink for a control device in an electric circuit of an automobile air conditioning system. The control device includes a power transistor which varies the amount of electric power supplied to a motor, so as to vary the rotational speed of the motor in response...http://www.google.com/patents/US5012656?utm_source=gb-gplus-sharePatent US5012656 - Heat sink for a control device in an automobile air conditioning system
