Food can of synthetic material

Claim 1

A PRESERVING CAN FOR FOOD AND THE LIKE COMPRISING A CONTAINER AND A LID, SAID CONTAINER AND SAID LID EACH HAVING A RIM PORTION CONSISTING OF A SYNTHETIC PLASTIC MATERIAL CAPABLE OF WITHSTANDING HEAT TREATMENT AT TEMPERATURES IN THE ORDER OF 80 TO 126*C., SAID MATERIAL BEING CHEMICALLY INERT TO FOODS AND THE LIKE AND MECHANICALLY STABLE WITH RESPECT TO STRAINS IMPOSED DURING SAID HEAT TREATMENT AND DURING HANDLING OF SAID CAN, SAID RIM PORTION OF SAID LID INCLUDING A DEPENDING ANNULAR TONGUE MEMBER, SAID TONGUE MEMBER HAVING AN OUTER SURFACE AND AN INNER SURFACE, ONE OF SAID TWO LAST-MENTIONED SURFACES BEING AN ESSENTIALLY CYLINDRICAL SURFACE EXTENDING ESSENTIALLY PERPENDICULARLY TO SAID LID, AND THE OTHER OF SAID TWO LAST-MENTIONED SURFACES EXTENDING AT AN OBTUSE ANGLE TO SAID LID FORMING AN ESSENTIALLY FRUSTO-CONICAL SURFACE, SAID RIM PORTION OF SAID CONTAINER BEING PROVIDED WITH AN UPWARDLY OPENING COOPERATING ANNULAR GROOVE RECEVING SAID TONGUE MEMBER, SAID GROOVE HAVING SIDES THEROF DEFINED BY SPACED ESSENTIALLY CYLINDRICAL WALL SURFACES, THE WIDTH OF SAID TONGUE MEMBER OVER AT LEAST A PORTION OF ITS LENGTH BEING GREATER THAN THE WIDTH OF SAID GROOVE, WHEREBY SAID GROOVE IS RESILIENTLY DEFORMED BY SAID TONGUE MEMBER UPON INSERTION OF SAID TONGUE MEMBER, AND MEANS INTEGRALLY BONDING SAID LID TO SAID CONTAINER IN A CONTINUOUS CIRCUMFERENTIAL SEAL.