Plastic lens
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jul 9, 1985
Grant Date -
N/A
app pub date -
Jul 22, 1982
filing date -
Jul 30, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A plastic lens of a stepped segment having an excellent surface hardness can be obtained at high molding efficiency from cast polymerization of a diethylene glycol bisallyl carbonate and specified acrylate(s) system further added with a specified diacrylate(s) and/or dimethacrylate(s).
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