Method and apparatus for removing excess lens forming material

Details Method and apparatus for removing excess lens forming material Method and apparatus for removing excess lens forming material

1992-11-02

1994-05-31

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

249 82, 249141, 249160, 264 22, 264 26, 425808, 425812, B29D 1100

Patent

active

053167007

ABSTRACT:
Process and apparatus for molding the front and rear surfaces of a contact lens in one step is disclosed. Two mold halves matable to form a contact-lens-shaped cavity and a cavity for excess lens forming material surrounding the cavity are provided. The improvement comprises providing the cavity for excess lens forming material with at least two openings and producing differential gas pressure across the openings to remove excess lens forming material.

REFERENCES:
patent: 4138086 (1979-02-01), Mizutani et al.
patent: 4197266 (1980-04-01), Clark et al.
patent: 4680149 (1987-07-01), Rawlings et al.
patent: 5143660 (1992-09-01), Hamilton et al.

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