Anti-counterfeiting measures for glass articles

Abstract

A glass container including a body having a delamination factor less than or equal to 10 and at least one marking is described. The body has an inner surface, an outer surface, and a wall thickness extending between the outer surface and the inner surface. The marking is located within the wall thickness. In particular, the marking is a portion of the body having a refractive index that differs from a refractive index of an unmarked portion of the body. Methods of forming the marking within the body are also described.

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         12 . A method of forming an anti-counterfeit marking in a pharmaceutical package, comprising:
 focusing a pulsed laser beam at a point within a wall thickness of a body formed from an alkali-aluminosilicate glass composition, the wall thickness extending between an inner surface and an outer surface of the body; and   translating the pulsed laser beam along a scan path within the wall thickness effective to induce a change in a refractive index along the scan path relative to a refractive index of a portion of the body unexposed to the pulsed laser beam, thereby forming the anti-counterfeit marking in the pharmaceutical package.   
     
     
         13 . The method of  claim 12 , further comprising ion-exchange strengthening the body prior to focusing the pulsed laser beam and translating the pulsed laser beam. 
     
     
         14 . The method of  claim 12 , further comprising ion-exchange strengthening the body subsequent to focusing the pulsed laser beam and translating the pulsed laser beam. 
     
     
         15 . The method of  claim 12 , wherein the pulsed laser beam has a pulse energy of from about 1000 nJ to about 5000 nJ. 
     
     
         16 . The method of  claim 12 , wherein the pulsed laser beam has a wavelength of from about 900 nm to about 1600 nm. 
     
     
         17 . The method of  claim 12 , wherein the pulsed laser beam has a pulse frequency of from about 0.05 MHz to about 0.5 MHz. 
     
     
         18 . The method of  claim 12 , wherein the body has a delamination factor of less than or equal to 3. 
     
     
         19 . The method of  claim 12 , the body further comprising a compressively stressed layer extending from the outer surface of the body into the wall thickness, wherein the point at which the pulsed laser beam is focused is not within the compressively stressed layer. 
     
     
         20 . The method of  claim 12 , wherein the anti-counterfeit marking is covert.