Inflatable article
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United States of America Patent
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Apr 7, 1992
Grant Date -
N/A
app pub date -
Apr 8, 1991
filing date -
Apr 8, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is an inflatable ball including at least an upper layer, a lower layer and an intermediate layer of flexible sheets, which are overlapped and heat-sealed together along their circumferences so as to form an inflatable upper chamber between the upper and intermediate layers, and an inflatable lower chamber between the lower and intermediate layers. The intermediate layer is made to contract in its heat-sealed circumference after heat sealing, thus obtaining an improved inflatable ball which requires smaller inflation pressure, and which results in smaller deformation in its upper and lower layers in an inflated state.
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