Signals and indicators – Indicators – Methods
Patent
1987-10-05
1989-05-02
Shoop, Jr., William M.
Signals and indicators
Indicators
Methods
215250, 215252, 215230, 206807, 350442, 350105, 340572, B65D 5502
Patent
active
048258016
ABSTRACT:
An improved tamper indicating seal is disclosed, characterized by the generation of a unique signature pattern which, if altered, is indicative of tampering. The seal includes a layer of transparent material which is applied to at least a portion of a secure object or container. A plurality of particles of refective material are randomly arranged within the layer in a unique orientation. When the seal is exposed to light, the particles reflect a portion of the light to produce a unique reflective pattern which corresponds with the orientation of the particles. Alteration of the particle orientation as a result of tampering alters the reflective pattern. Thus when the reflected pattern of a seal does not correspond with its original signature pattern, tampering is indicated.
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Ip Paul
Maser Thomas O.
Shoop Jr. William M.
The United States of America as represented by The Director of N
Utermohle John R.
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