(under subclass 686) Waterbed with unitary bladder in which a 90 deg. portion of the bladder perimeter is strengthened to prevent rupture of the bladder.
(1) Note. The corner areas may be reinforced by sealingly attaching additional layers of plastic materials to the corners of the bladder.
(2) Note. The corner reinforcing means may be rough or textured materials that have the additional function of gripping and retaining bedclothes between a bladder and a frame.
SEE OR SEARCH THIS CLASS, SUBCLASS:
739, for mattresses that have means to form or strengthen the edge, border, or corner of the mattress.
