Blow molded glass article manufacture

A process for forming diverse decorative patterns on the inner surface of diverse blow molded glass articles with the utilization of the same basic equipment comprising forming a discrete gob of molten glass, transporting the gob to an anvil, removably attaching a pattern forming insert on a die, disposing the die in line with the anvil with the removably attached pattern thereon corresponding to the decorative pattern, moving the anvil and die relatively toward each other until the die contacts the gob and the pattern on the die imprints a corresponding pattern on one generally flat horizontal surface of the gob to form a parison therefrom, forming the parison in a generally flat form, transporting the parison to a blow molding station, blowing against the generally flat horizontal imprinted surface of the parison to form a glass article of non-uniform thickness with the imprinted surface comprising the inner surface of the article, detaching the pattern forming insert when a different decorative pattern is to be formed, removably attaching to the die a different pattern forming insert corresponding to the different pattern, and repeating the gob forming and transporting steps and the anvil and die contacting and parison transporting and blowing steps.