Plastic cap featuring excellent sealing and venting
AssigneeToyo Seikan Kaisha, Ltd.
InventorsShinji Ooka, Yuji Tomitaka, Manabu Aihara, Shinya Matsumoto
Life of this patent
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Abstract
A plastic cap comprising a top panel and a skirt hanging down from the peripheral edge of the top panel, the inner surface of the top panel forming an inner ring that forms a seal upon coming into intimate contact with the inner surface of the wall of the mouth of a container, and the inner surface of skirt forming a screw thread that comes into engagement with a screw thread formed on the outer surface of the wall of the mouth of the container, wherein a slender recessed portion is formed in a number of at least one in the inner surface of said inner ring extending upward from an end thereof. The cap features both excellent sealing and excellent venting.
Claims11
A plastic cap comprising a top panel and a skirt hanging down from a peripheral edge of the top panel, an inner surface of said top panel having an inner ring that forms a seal upon coming into intimate contact with an inner surface of a mouth-wall of a container, and an inner surface of said skirt having a screw thread that comes into screw engagement with an outer surface of the mouth-wall of the container, wherein at least one slender recessed portion is formed in an inner surface of said inner ring so as to extend upward from an end thereof.
Dependencies are inferred from the claim text.