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US 4,211,384 AGranted
Molding assembly for casting soft contact lenses
AssigneeEssilor International Cie Generale d'Optique
InventorsClaude Bourset, William Lenne
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AssigneeEssilor International Cie Generale d'Optique
InventorsClaude Bourset, William Lenne
Estimating the term…
A molding assembly for casting soft contact lenses especially such lenses formed of hydrophobic material. Such a molding assembly comprises a molding cavity defined by the dies of the assembly and an annular gasket or sealing member joining the peripheries thereof. The perimeter of largest diameter of the molding cavity is defined by contact between a sealing ridge which is part of the concave die or the gasket or sealing member and a bearing surface which is part of the other of the concave die or the gasket or sealing member. The annular gasket or sealing member may have an annular skirt adapted to embrace the concave die in the closed position of the assembly. The gasket or sealing member is carried by the convex die and may be integrally formed in one piece with the convex mold.
A molding assembly for casting soft contact lenses, comprising a concave die and a convex die disposed opposite each other and a resilient material gasket establishing a junction between the peripheries of the dies defining together a molding cavity, the outer perimeter of the molding cavity being defined by line contact between a sealing ridge and a bearing surface, the sealing ridge being part of one of the concave die and the annular gasket and the bearing surface being part of the other of the concave die and the resilient material gasket.
Dependencies are inferred from the claim text.