Patents Assigned to Trigon Industries Limited
  • Gas indicator for a package
    Patent number: 5439648
    Abstract: A gas indicator (11) for a modified atmosphere food package (19) comprises a series of strips (12, 13, 14, 15, 16) which progressively change colour as the proportion of carbon dioxide in the atmosphere progressively changes in magnitude due to absorption of the carbon dioxide by the food product (17) over time. The indicator (11) thus is "tuned" to indicate changing atmospheric conditions inside a see-through envelope (10) and thus the condition of the product (17) can be monitored and the package (19) is tamper evident.
    Type: Grant
    Filed: May 26, 1994
    Date of Patent: August 8, 1995
    Assignee: Trigon Industries Limited
    Inventors: Simon N. Balderson, Robert J. Whitwood