Composite vessel lid
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United States of America Patent
Stats
-
Nov 14, 1989
Grant Date -
N/A
app pub date -
Mar 3, 1989
filing date -
Mar 4, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Disclosed is a composite vessel lid comprising an outer lid of a plastic material to be engage with a neck of a vessel and an inner lid of a thin metal sheet held within the outer lid. Fine projections are formed at predetermined intervals in the abutting portion between the outer and inner lids, and a gas-releasing path is formed among the fine projections. Since the gas-releasing path is not formed in a portion engaging with a vessel, such as a screwed portion of the outer lid, the engaging force is not reduced and the strength of the outer lid is not reduced, and release of gas is promptly accomplished effectively at the initial stage of opening.
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