Plastic drinking cups

Claim 1

AN INJECTION MOULDED PLASTIC CUP COMPRISING A HOLLOW, THIN WALLED, OPEN TOPPED BODY, DEFINED BY A CIRCUMFERENTIAL SIDEWALL AND AN INTEGRAL BASE, SAID SIDEWALL BETWEEN ITS TGOP AND BOTOM BEING OF CORRUGATED FROM PROVIDING A SERIES OF ALTERNATING SUBSTANTIALLY PARALLEL INTERNAL AND EXTERNAL RIBS AND VALLEYS EXTENDING IN THE DIRECTION OF THE LONGITUDINAL AXIS OF SAID BODY, SAID EXTERNAL RIBS TERMINATING IN PEAKS WHICH FORM A GRIPPING AREA FOR THE HAND OF A USER, THE SPACING BETWEEN THE RIBS BEING SUFFICIENTLY CLOSE AS TO CAUSE THE CONTACTING SURFACES OF THE USER''S HAND TO ENGAGE THE PEAKS OF SAID RIBS WHILE SPANNING THE INTERVENING EXTERNAL VALLEYS, SAID EXTERNAL VALLEYS FORMING HEAT-DISSIPATING AIR CIRCULATING CHANNELS, SAID RIBS AND VALLEYS BEING FORMED BY CONVERGING PORTIONS OF SAID SIDE WALL, SAID VALLEYS ON THE INSIDE OF SAID SIDE WALL BEING AUGMENTED WITH PLASTIC WHERE THE PORTIONS OF THE SIDE WALL CONVERGE TO THICKEN AND STRENGTHEN THE RIBS ON THE OUTSIDE OF SAID SIDE WALL.