Method of detecting wear on a substrate using a fluorescent...

Radiant energy – Luminophor irradiation – With ultraviolet source

Reexamination Certificate

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C356S317000, C356S417000

Reexamination Certificate

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06864489

ABSTRACT:
A method of detecting wear on a substrate including coating a composition that includes a fluorescent compound on the surface of a first substrate, exposing the coated surface to wear, exposing the coated surface to radiation capable of exciting the fluorescent compound, and detecting the presence or absence of fluorescence.

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