Coating processes – Direct application of electrical – magnetic – wave – or... – Pretreatment of substrate or post-treatment of coated substrate
Reexamination Certificate
2007-05-17
2009-11-24
Nguyen, Sang (Department: 2886)
Coating processes
Direct application of electrical, magnetic, wave, or...
Pretreatment of substrate or post-treatment of coated substrate
C427S098400, C427S099400, C427S157000, C427S594000, C428S041500, C356S230000
Reexamination Certificate
active
07622163
ABSTRACT:
The invention is directed to a method by exposing at least a portion of a luminescent coating disposed on a surface of an article to ultraviolet light at one or more preselected wavelengths causing said luminescent coating to exhibit a luminescence spectrum, the luminescence spectrum exhibiting a plurality of intensity peaks that have been priorly determined to create a standard; determining the intensity of at least two peaks in the luminescence spectrum of the coating; determining a peak intensity ratio of the at least two peaks; comparing the peak intensity ratio determined with the standard; and, classifying the article according to whether or not the peak intensity ratio does or does not match the standard; wherein the luminescent coating comprises a particulate luminescent composition comprising a rare earth doped fluoride represented by the formulain-line-formulae description="In-line Formulae" end="lead"?RExA1−xF2+x−2yOyin-line-formulae description="In-line Formulae" end="tail"?wherein RE represents a three-valent rare-earth element, A is alkaline earth, 0.002≦x≦0.20, and 0≦y≦x.
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Crawford Michael Karl
Mikeska Kurt Richard
E.I. du Pont de Nemours and Company
Nguyen Sang
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