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Spoilage indicator for food containers

  • US 3,067,015 A
  • Filed: 01/29/1960
  • Issued: 12/04/1962
  • Est. Priority Date: 01/29/1960
  • Status: Expired due to Term
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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