Timer and storage condition indicator
AssigneeMicro-Circuits Company
InventorsRobert F. Bradley, Lindell P. Bradley
Life of this patent
Estimating the term…
Abstract
A disposable timer and product storage condition indicator in which components of a carrier mixture react physically and/or chemically with one or more receptive layers. The carrier mixture and receptive layers are so comprised as to react during a given time interval, the interval being dependent upon and constantly modified by such external physical conditions as temperature, moisture, light, radiation, or pressure. During the timing period the device can either give a changing color display which is matched in rate to the declining freshness of a food or medicine in a container to which the device is attached or can cause the appearance or disappearance of words or symbols or sticky areas or odors. A variety of means for activating the timer are possible.
Claims12
A device for indicating time lapse alone or time lapse integrated with various ambient physical environmental conditions:
- said device comprising a first layer to be placed on the article to be timed when timing is to begin, a carrier mixture contained in said first layer, a transfer layer of substantially the same size as said first layer adapted to accept said carrier mixture within various elapsed time limits, said transfer layer being initially separate and remote from said first layer and placed in contact with said first layer when the timing and integration are to begin, a component in said device responsive to one or more of the ambient conditions and said time limits varying as at least one of the ambient physical conditions varies, a means of notification of progress of said carrier mixture in said transfer layer, a cover layer larger than said first layer and said transfer layer for enclosing the top and sides of said layers against the article to be timed, said cover layer being initially separate and remote from said first and transfer layers and placed over said layers when the timing and integration are to begin, and an adhesive layer on said cover layer to seal said layers to the article when said device is assembled.
Dependencies are inferred from the claim text.