Raymond G Ragan, James G Stephenson, Charles L Zuck: Patient warming or cooling blanket. Progressive Dynamics, Beaman & Beaman, June 30, 1992: US05125238 (141 worldwide citation)

A disposable patient heating or cooling blanket having three layers of flexible sheeting two of which form an air chamber, the third of which is a comfortable layer for contact with the patient and which, having a greater friction characteristic, aids in keeping the blanket in place on the patient. ...