Method and mold for molding plastic lenses
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United States of America Patent
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Jan 18, 2005
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N/A
app pub date -
Aug 5, 2002
filing date -
Aug 5, 2002
priority date (Note) -
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Abstract
A method for making an organic glass lens or lens blank which comprises providing a two-piece mold defining a molding cavity having a vertical axis which is part of a fixed reference system comprising said vertical axis and a horizontal axis which intersects at the center of the mold, a liquid tight annular closure member disposed at the periphery of the mold pieces for maintaining the two mold pieces and closing the molding cavity, wherein the annular closure member comprises at least a portion thereof made of a material that is initially gas permeable but becomes gas impermeable when in contact with a liquid polymerizable composition.
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