Method and apparatus for removing excess lens forming material
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
May 31, 1994
Grant Date -
N/A
app pub date -
Nov 2, 1992
filing date -
Nov 2, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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