Making invisible logos using hydrophobic and hydrophilic...

Coating processes – Applying superposed diverse coating or coating a coated base

Reexamination Certificate

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C427S240000, C427S248100, C427S282000, C427S294000, C204S192100

Reexamination Certificate

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07048971

ABSTRACT:
Invisible logos may be made by forming a hydrophilic coating and a hydrophobic coating on a substrate surface, so that a portion of the hydrophilic coating and a portion of the hydrophobic coating are exposed. The invisible logos are undetectable to the human eye, but may be temporarily viewed in response to stimuli.

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