Molding assembly for casting soft contact lenses

Details Molding assembly for casting soft contact lenses Molding assembly for casting soft contact lenses

1979-02-06

1980-07-08

Flint, Jr., J. Howard

Static molds

Container-type molding device

Having plural mold sections

425808, B29C 500, B29D 1100

Patent

active

042113849

ABSTRACT:
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.

REFERENCES:
patent: 3211811 (1965-10-01), Lanman
patent: 3475521 (1969-10-01), Stroop
patent: 3915609 (1975-10-01), Robinson
patent: 4113224 (1978-09-01), Clark
patent: 4121896 (1978-10-01), Shepherd
patent: 4138086 (1979-02-01), Migutani et al.

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