Irreversible metal film display

Details Irreversible metal film display Irreversible metal film display

2005-05-24

2005-05-24

Wellington, A. L. (Department: 3722)

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing chemical

C283S017000, C283S070000, C283S072000, C283S096000, C283S097000, C283S098000, C283S901000, C283S903000, C040S406000, C040S407000, C040S615000, C040S675000, C116S206000, C428S321100, C428S321500, C428S916000

Reexamination Certificate

active

06896296

ABSTRACT:
Display information is revealed from behind a metal film that can be cleared upon effective contact with a clearing agent. The metal film, while opaque, is generally less than 1000 Angstroms thick and can be cleared by exposure to innocuous agents including food or other household products.

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patent: 6641691 (2003-11-01), Shadle et al.
patent: 2358611 (1981-11-01), None
patent: 2074943 (2001-08-01), None

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