A mask such as a laryngeal mask or face mask, has a soft annular cuff on a more rigid mount of funnel shape. The cuff and mount are moulded together by rotational moulding or the mount is preformed and the cuff is moulded onto the mount in a rotational mould. ...http://www.google.es/patents/US20010025641?utm_source=gb-gplus-sharePatente US20010025641 - Masks and their manufacture
