Letter card

Details Letter card Letter card

1997-08-26

1999-04-06

Han, Frances

Printed matter

Miscellaneous

283 95, 283103, 446220, G09F 100, A63H 3300, A63H 3304

Patent

active

058907440

ABSTRACT:
A letter card having a covering with a tear line on the inside, and a shaped inflatable device received inside the covering, the shaped inflatable device holding an acidic chemical means and a separating layer and a basic chemical means separated from the acidic chemical means by the separating layer, the acidic chemical means and the basic chemical means being mixed together to produce a chemical reaction and to release a gas when breaking the separating layer by force, thereby causing the shaped inflatable device to swell and to come out of the covering.

REFERENCES:
patent: 4898561 (1990-02-01), Nottingham et al.
patent: 5199745 (1993-04-01), Balsamo
patent: 5573437 (1996-11-01), Van Dyke et al.

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