Patent ID: 9366784
Filing Date: 2016-06-14
CPC Classification: C03C,G02B,Y10T

Claim Text:
1. An article comprising: a substrate having a surface; and an optical film disposed on the substrate surface forming a coated surface; wherein the article comprises a maximum hardness of 12 GPa or greater, as measured by a Berkovich Indenter Hardness Test along indentation depths of about 100 nm or greater, an average transmittance of 85% or greater over a visible spectrum, and a color shift of 2 or less, when viewed at an incident illumination angle in the range from about 2 degrees to about 60 degrees from normal incidence under an illuminant comprising CIE A illuminants, CIE B illuminants CIE C illuminants, CIE D illuminants or CIE F illuminants, wherein color shift is determined by the equation √((a*