Non-spill drinking cup

Claim 1

A NON-SPILL DRINKING CUP: SAID NON-SPILL DRINKING CUP COMPRISING A LIQUID RESERVOIR, A BODY AND A VALVE PLATE; SAID LIQUID RESERVOIR COMPRISING A VESSEL HAVING SIDES AND A CLOSED BOTTOM AND AN OPEN TOP ADAPTED TO RETAIN LIQUID THEREIN WHEN IN AN UPRIGHT POSITION; SAID BODY HAVING AN UPPER END AND A LOWER END, SAID LOWER END BEING CONTIGUOUS WITH SAID OPEN END OF SAID VESSEL, SAID UPPER END HAVING A DRINKING LIP THEREON, A DOWNWARDLY FACING INWARDLY EXTENDING CONTINUOUS SEALING SURFACE ON SAID BODY BELOW ITS UPPER END, A GUIDE SURFACE ON SAID BODY, SAID GUIDE SURFACE BEING POSITIONED OUTWARDLY FROM SAID INWARDLY EXTENDING CONTINUOUS SEALING SURFACE, SAID SEALING SURFACE BEING SUBSTANTIALLY PLANAR AND EXTENDING FROM AN INTERIOR DIAMETER OUTWARDLY TO SAID GUIDE SURFACE; SAID VALVE PLATE BEING POSITIONED BELOW SAID SEALING SURFACE, SAID VALVE PLATE HAVING A CONTINUOUS UPPER VALVING SURFACE OF SUFFICIENT SIZE TO BE ADAPTED TO LIE AGAINST SAID SEALING SURFACE TO SEALINGLY ENGAGE SAID SEALING SURFACE, SAID VALVE PLATE HAVING PORTIONS OF LARGER RADIUS AND PORTIONS OF LESSER RADIUS, SAID PORTIONS OF LESSER RADIUS BEING OF LARGER RADIUS THAN INTERIOR DIAMETER AND SAID PORTIONS OF LARGER RADIUS BEING IN SLIDING ENGAGEMENT WITH SAID GUIDE SURFACE TO GUIDE SAID VALVE PLATE TOWARD AND AWAY FROM SAID SEALING SURFACE, SO THAT WHEN SAID VALVE PLATE IS IN ENGAGEMENT WITH SAID SEALING SURFACE SAID VESSEL IS CLOSED TO THE EXTERIOR.