In-situ standard for temperature indicating labels
AssigneeCordis Corporation
InventorsJames R. Bonds, Richard B. Barrett
Life of this patent
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Abstract
The temperature indicating surface, typically a label, includes an irreversibly fusible coating which changes from a first appearance to a second appearance in response to exposure to a threshold temperature or rated temperature. An in situ standard is provided by initially fusing selected areas of the temperature indicating surface so that a pattern is visible prior to exposure to the threshold temperature. Upon exposure to the threshold temperature, however, the entire temperature indicating surface is fused thereby presenting a uniform appearance and unambiguous evidence of prior exposure to the threshold temperature.
Claims14
A temperature indicating surface comprising:
- a layer of material which substantially irreversibly changes from a first appearance to a second appearance in response to exposure to a threshold temperature, and where said material irreversibly fuses in response to said threshold temperature, wherein a first portion of said layer of material is initially free from exposure to said threshold temperature prior to use by a user and is thereby fusible which provides said first appearance to said first portion, and wherein a second portion of said layer of material is initially exposed to said threshold temperature prior to use by a user and thereby is fused which provides said second appearance to said second portion, whereby said first portion and said second portion form a visible pattern.
A temperature indicating surface including:
- an absorptive layer with a first pattern printed thereon;
- a second pattern printed with irreversibly fusible material on a surface of said absorptive layer over said first pattern, thereby at least partially obscuring said first pattern;
- and
- wherein said irreversibly fusible material, upon exposure to a threshold temperature, melts and is absorbed into said absorptive layer, thereby exposing said first pattern to view.
A temperature indicating surface including a first portion comprised of material that irreversibly fuses upon exposure to a threshold temperature thereby changing from a first appearance to a second appearance, said first portion initially being fusible prior to use by a user to provide said first appearance, and further including a second portion of said material being fused prior to use by a user to provide said second appearance.
Dependencies are inferred from the claim text.