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US 5,851,611 AGranted
Multi-layered storage container
AssigneeAlvin Guttag
InventorAlvin Guttag
Life of this patent
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Abstract
One aspect of the present invention reveals a multi-layered storage container that changes color in response to acid gases. The storage container is comprised of at least one layer of a plastic and at least one layer of a gas-barrier polymer. Furthermore, the multi-layered storage container is provided with a color-changing indicator to show the presence of acidic gases. The other aspect of the present invention reveals a diaper which, as the result of chemical and/or electrical processes, can indicate when the diaper is wet.
Claims15
A multi-layered storage container that indicates the presence of acid gases by colored change, comprising:
- (a) at least one layer of a gas-porous plastic wherein the gas is selected from the group consisting of carbon dioxide, hydrogen chloride, sulfur dioxide and sulfur trioxide and wherein the plastic is selected from the group consisting of a hydrocarbon polymer of a mono-olefin having two to six carbon atoms, ethylene-mono-olefin copolymer, linear polyester, polycarbonate and polystyrene,
- (b) at least one layer of a gas-barrier polymer, said gas-barrier polymer being decomposable to form an acid gas,
- wherein the innermost layer of said multi-layer storage container is made of said gas-porous plastic, and wherein at least one layer of said multi-layer storage container is provided with a color-changing indicator which changes color to show the presence of the acid gas formed by the decomposition of said gas-barrier polymer.
Dependencies are inferred from the claim text.