Spoilage indicator for food containers
First Claim
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1. THE COMBNATION WITH A WALLED FOOD CONTAINER OF A APOILAGE INDICATOR INCLUDING A TRANSPAENT WINDOW MOUNTED IN A WALL OF SAID CONTAINER, AN INDICATOR ELEMENT POSITIONED IN SAID CONTAINER BEHIND SAID WINDOW, A DIFFUSION SHEET BEHIND SAID INDICATOR ELEMENT, SAID DIFFUSION SHEET BEING UNIDIRECTIONALLY PERMEABLE TO GASES BUT IMPERMEABLE TO LIQUIDS AND SOLIDS, SAID DIFFUSION SHEET FURTHER BEING ATTACHED TO SAID WINDOW ALONG ITS MARGINAL EDGES, WHEREBY SAID INDICATOR ELEMENT IS SELECTED BETWEEN SAID SHEET AND SAID WINDOW, SAID INDICATOR ELEMENT INCLUDING A COLOR
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1 Claim
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1. THE COMBNATION WITH A WALLED FOOD CONTAINER OF A APOILAGE INDICATOR INCLUDING A TRANSPAENT WINDOW MOUNTED IN A WALL OF SAID CONTAINER, AN INDICATOR ELEMENT POSITIONED IN SAID CONTAINER BEHIND SAID WINDOW, A DIFFUSION SHEET BEHIND SAID INDICATOR ELEMENT, SAID DIFFUSION SHEET BEING UNIDIRECTIONALLY PERMEABLE TO GASES BUT IMPERMEABLE TO LIQUIDS AND SOLIDS, SAID DIFFUSION SHEET FURTHER BEING ATTACHED TO SAID WINDOW ALONG ITS MARGINAL EDGES, WHEREBY SAID INDICATOR ELEMENT IS SELECTED BETWEEN SAID SHEET AND SAID WINDOW, SAID INDICATOR ELEMENT INCLUDING A COLOR
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Current AssigneeRay F. Lawdermilt
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Original AssigneeRay F. Lawdermilt
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InventorsLawdermilt, Ray F.
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Application NumberUS04/005,473Time in Patent Office1,040 DaysField of SearchUS Class Current422/407CPC Class CodesB65D 79/02 Arrangements or devices for...G01N 21/783 for analysing gasesG01N 31/22 using chemical indicators G...
