초록 ▼

A critical temperature indicator is provided utilizing the volume reduction characteristics of organic compounds as they undergo a change from the liquid state to the solid state. The bulb and a portion of the capillary tube of a thermometer-like structure contains a colorless organic compound. Anot

A critical temperature indicator is provided utilizing the volume reduction characteristics of organic compounds as they undergo a change from the liquid state to the solid state. The bulb and a portion of the capillary tube of a thermometer-like structure contains a colorless organic compound. Another organic compound saturated with a dye, which compound has a solidification temperature lower than that of the colorless compound and which is miscible with the colorless compound, is located in the capillary tube and separated from the colorless compound by a solid, movable plug or a liquid which is immiscible with either the colorless or the dyed compound. The volume of the colorless compound upon solidification is less than the volume of the bulb so that the separating plug or liquid and at least a portion of the dyed compound are drawn into the bulb upon solidification. The dyed compound then mixes with the colorless compound to provide a visual indication that the colorless compound has solidified.

대표청구항 ▼

A critical temperature indicator comprising: a hollow bulb; a capillary tube communicating with said bulb; a colorless first liquid filling said bulb and extending into said tube which is capable of solidification and exhibits the property of volume reduction upon solidification; a second liquid loc

A critical temperature indicator comprising: a hollow bulb; a capillary tube communicating with said bulb; a colorless first liquid filling said bulb and extending into said tube which is capable of solidification and exhibits the property of volume reduction upon solidification; a second liquid located within said tube which is miscible with said first liquid and has a solidification temperature lower than that of said first liquid; and separating means interposed between said first and second liquids for preventing mixing thereof within said tube; the volumes of said first liquid upon solidification and said separating means being less than the volume of said bulb so that said separating means and at least a portion of said second liquid are drawn into said bulb upon solidification of said first liquid to provide a visual indication that said first liquid has solidified.