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US 4,784,284 AGranted
Cover for a can-shaped container
AssigneeShowa Denka K.K.
InventorsOtohiko Miyauchi, Yoshihiko Kawakami, Mitsuo Imai, Junji Yotsuyanagi
Life of this patent
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Abstract
A cover for a can comprising a multi-layer base of aluminum foil between heat-fusible resin layers and an overlying laminated resin layer. The outer resin layer has an inner section and a surrounding outer section separated by a gap through which the multi-layer base is exposed. The gap is smooth and continuous, that is, does not have a point, so that the inner section can be leveraged into the multi-layer base and the stress is uniformly distributed over a wide area of the multi-layer base.
Claims13
A cover for a can-shaped container, comprising:
- a multi-layer base comprising a metallic foil impermeable to oxygen and moisture and a heat-fusable resin layer formed on each side of said metallic foil;
- a resin layer laminated to said multi-layer base and comprising an outer planar part and an inner planar part, said inner part being completely contained within said outer part and separated from said outer part by a gap between said resin layers, said inner part having a pedestal with an outer periphery contiguous with said gap, said outer periphery having a substantially circular shape;
- and
- tearing means including a grip having a first portion attached to said pedestal and a second portion extending away from said first portion, said first portion having an outer periphery of substantially the same shape as said outer periphery of said pedestal, wherein said outer periphery of said first portion and said outer periphery of said pedestal are co-extensive relative to said gap to enable said first portion to press against said pedestal and puncture said multi-layer base over the arc-length of said circular outer periphery of said pedestal when said second portion is lifted.
1 more element
Dependencies are inferred from the claim text.