Accelerated development time-delayed message system

Details Accelerated development time-delayed message system Accelerated development time-delayed message system

1995-12-04

1997-05-27

Roskoski, Bernard

Horology: time measuring systems or devices

Miscellaneous

116200, G04B 1700, G01N 3122

Patent

active

056338368

ABSTRACT:
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.

REFERENCES:
patent: 3520124 (1970-07-01), Myers
patent: 4212153 (1980-07-01), Kydonieus et al.
patent: 4903254 (1990-02-01), Haas
patent: 5058088 (1991-10-01), Haas et al.
patent: 5085802 (1992-02-01), Jalinski
patent: 5107470 (1992-04-01), Pedicano et al.
patent: 5182212 (1993-01-01), Jalinski

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