초록 ▼

A time-delayed message indicator system typically displays a printed message pattern on a contrasting viewing surface at a predetermined time after activation. One preferred indicator system employs a migrating message pattern and has a laminar, multilayer construction. The message is printed on a s

A time-delayed message indicator system typically displays a printed message pattern on a contrasting viewing surface at a predetermined time after activation. One preferred indicator system employs a migrating message pattern and has a laminar, multilayer construction. The message is printed on a source layer using a migratable ink. An opaque layer overlies the source layer and a release layer protects the migratable message from contact with the opaque layer until the system is activated by removal of the release layer initiating migration of the message ink through the opaque layer. Arrival of the message agent at the viewing surface initiates development of a visible message pattern. To enhance the development process the invention includes a message development trigger, for example, a heating system. The heating system can consist of exothermic chemical reactants that are mixed to react and produce heat, for example by oxidizing iron filings or activated carbon. Other embodiments employ buffered pH indicators and a migrating acid or base.

대표청구항 ▼

A time-delayed message display system for displaying a message pattern of a colorant at a viewable surface against a contrasting background, the message pattern being viewable by reflected light at a predetermined time after activation of the message display system, said message display system havin

A time-delayed message display system for displaying a message pattern of a colorant at a viewable surface against a contrasting background, the message pattern being viewable by reflected light at a predetermined time after activation of the message display system, said message display system having an essentially laminar, multilayer construction and comprising: a) a source layer; b) a migratable message agent supported on the source layer; c) a viewable surface; d) an opaque polymer film layer to overlie said source layer and to provide said viewable surface or to lie between said viewable surface and said source layer, said message agent being migratable through said opaque polymer film layer to said viewable surface; and e) a release layer protecting said message agent from contact with said opaque polymer film layer, said release layer being removable to activate the system by initiating migration of said message agent through said opaque polymer film; wherein arrival of said message agent at said viewable surface initiates development of a visible message pattern, said message display system further comprising: f) a message development trigger acting to accelerate migation of said message agent through said opaque polymer film to promote said development of a visible message pattern; and g) a trigger delay means to delay action of said message development trigger; whereby development of said visible message is accelerated and initiation of development is delayed by said trigger delay means.