Apparatus and method for producing center gated lens molds for c

Details Apparatus and method for producing center gated lens molds for c Apparatus and method for producing center gated lens molds for c

1996-02-09

1998-02-10

Vargot, Mathieu D.

Static molds

Container-type molding device

264 25, 264225, 2643281, 425568, 425808, B29D 1100

Patent

active

057165408

ABSTRACT:
A method and apparatus for the manufacture of lens molds used in the formation of optical contact lenses, the apparatus including a center gate aligned on the central axis of the lens mold cavity for delivery of the melt polymer in an axisymmetrical manner. The methodology produces lens molds of extremely precise dimensions as measured against lens molds produced with side gated technology.

REFERENCES:
patent: 4284591 (1981-08-01), Neefe
patent: 4640489 (1987-02-01), Larsen
patent: 4836960 (1989-06-01), Spector et al.
patent: 5139724 (1992-08-01), Hofstetter et al.
patent: 5456864 (1995-10-01), Wickes et al.
patent: 5632936 (1997-05-01), Su et al.

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