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Device for indicating the passage of time and method therefor and articles therewith

An oxygen permeation and receiver technology, which can be used in devices for measuring time intervals, time interval measurement without a driving mechanism, and analysis using chemical indicators, which can solve problems such as increased costs and safety hazards.

Inactive Publication Date: 2008-01-09
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These steps, in particular, may add to the cost of manufacturing such systems
Furthermore, this method of time indication uses a considerable amount of liquid containing reactive reagents, and rupture of the pouch presents a safety hazard

Method used

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  • Device for indicating the passage of time and method therefor and articles therewith
  • Device for indicating the passage of time and method therefor and articles therewith
  • Device for indicating the passage of time and method therefor and articles therewith

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0085] In the following examples, a highly oxygen-barrier plastic film (such as PVDC-coated PET film or heat-sealable PET film) or polypropylene film was used to prepare the receiver of the time indicating device. Dyes Cibanon Yellow GC PST (00943HF4) dye was obtained from Ciba Specialty Chemicals, High Point, North Carolina. The amounts of dye, NaOH, and sodium dithionite ("hydro") used in the examples are shown below.

[0086] The time intervals for "Elapsed Time" (ET), "Color Transition Time" (CTT), "Delay Time" (DT) and "Message Display Time" (MAT) are defined in conjunction with Figure 1, as shown below.

[0087] General procedure for preparing a time indicating device

[0088] A time indicating device according to the invention as described above was prepared for the following examples:

[0089] Prepare the desired size (e.g. 1.5" x 3.0" (3.8cm x 7.6cm) or 1" x 1" (2.5cm x 2.5cm)) by placing two sheets of film on top of each other and double heat sealing the bottom e...

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Abstract

A time-indicating apparatus based on the color change property of a reduced redox dye in the presence of oxygen is characterized by the initial introduction into a receptacle of a predetermined metered amount of a redox dye in its oxidized form together with a predetermined effective amount of a reducing agent in an alkaline medium. The conversion of the oxidized form of the redox dye into its reduced form occurs within the sealed receptacle. Precisely controlling the amount of both the oxidized dye and the amount of reducing agent introduced into the receptacle ensures that only a predetermined amount of the reduced form of the redox dye is able to be formed within the receptacle. The amount of reduced dye formed within the receptacle having a predetermined total surface area and the rate at which oxygen is able to enter into the receptacle allows the color transition time interval of the redox dye to the precisely controllable. Methods for making the time-indicating apparatus are also disclosed. Articles such as a container for a time-sensitive product and badge for indicating the expiration of a period of legitimacy incorporating the time-indicating apparatus are also disclosed.

Description

[0001] The present invention relates to a device for indicating the passage of time to a viewer, a method thereof and articles or containers, such as badges and containers for use in connection with time-sensitive products or devices. Background of the invention [0002] Many products or devices currently available to users are "time sensitive" in the sense that they have a limited duration or "shelf life" in terms of their freshness, potency and / or safety. Various attempts have been made to provide a time indicating device that enables the user to keep track of the time before the product becomes unusable. [0003] Time-indicating devices rely on a change in the color of a substance from an initially perceived color to a final perceived color. The time interval during which a substance changes from the initial to the final perceived color is defined as the "color transition time interval". During this application, the interval is measured from when the hue of the material's ...

Claims

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Application Information

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IPC IPC(8): G01N31/22G07C1/30G04F1/00
Inventor R·M·戈希尔
Owner EI DU PONT DE NEMOURS & CO
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