Apparatus for the production of contact lenses

Details Apparatus for the production of contact lenses Apparatus for the production of contact lenses

1976-03-24

1978-10-24

Spicer, Jr., Robert L.

Plastic article or earthenware shaping or treating: apparatus

Press forming apparatus having opposed press members

Male shaping member and female mold

264 1, 425808, 425DIG44, B29C 300

Patent

active

041218965

ABSTRACT:
There is provided a mold comprising a male and a female mold member fabricated from thermoplastic polymeric materials which, in very thin sections are flexible under polymerization conditions, but, under said conditions are sufficiently inflexible in thick sections to retain their shape and surface characteristics. Said mold is provided, on either the male or the female member with a thin rim which, during the polymerization process, flexes and permits the old members to approach each other and compensate for the shrinkage that occurs during polymerization. Said thin rim further forms the edge of the finished lens.

REFERENCES:
patent: 2089033 (1937-08-01), Miller
patent: 2965946 (1960-12-01), Sweet et al.
patent: 3077005 (1963-02-01), Sokol
patent: 3404861 (1968-10-01), Eewer
patent: 3422168 (1969-01-01), Bowser
patent: 3537137 (1970-11-01), Lancesseur
patent: 3761208 (1973-09-01), Boudet et al.
patent: 3871803 (1975-03-01), Beattie
patent: 3881683 (1975-05-01), Whitney
patent: 3915609 (1975-10-01), Robinson

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