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US 4,983,199 AGranted
Crystal container treated to impede the migration of lead to the container's contents
AssigneeCompagnie des Cristalleries de Baccarat
InventorJean Dumas
Life of this patent
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Abstract
Container made of crystal for containing any product and drink with acid characteristics, characterized in that in order to prevent the lead from migrating from the crystal to the products and drinks, the container has on its internal surface a thin and continuous film made of unleaded glass forming a "screen".
Claims2
A process for making a lead crystal container comprising the steps of:
- gathering a predetermined quantity of flowable unleaded glass into a drop shape;
- gathering a parison of crystal over said unleaded glass so as to cover said unleaded glass, said unleaded glass and said crystal having close to the same coefficient of expansion and index of refraction;
- and
- blowing said crystal and unleaded glass together to a desired container configuration having a cavity with an internal surface for holding a product in the container, the entire internal surface being covered with a continuous film of said unleaded glass.
1 more element
Dependencies are inferred from the claim text.