Patents FR 273917B1, "Method For Laser Marking of s Glass Object", wo 1996032221A1, "Method for laser marking a glass object", EP EP0820363B1, "Method for laser marking a glass object", ES 2146396T3, "Procedure for the Laser Marking of a Glass Object", DE 69607336T2, "Laser Marking Method of a workpiece of glass", and AU 701407B2, "Method for laser marking a glass object".