Improvements in heat exchanging head pieces for cooling or heating the entire hair bearing (scalp) area of the human head; improvements in a blank form for such product and purposes for filling with heat exchanging materials; a heat exchanging head piece for cancer chemotherapy patients to cool the scalp...http://www.google.com/patents/US4382446?utm_source=gb-gplus-sharePatent US4382446 - Heat transfer devices for the scalp
